Vaillant ecoTEC plus 806 VU GB 806/5-5, ecoTEC plus 1006 VU GB 1006/5-5, ecoTEC plus 1206 VU GB 1206/5-5 Installation And Maintenance Instructions Manual

For the competent person

Installation and maintenance instructions

ecoTEC plus

VU GB .../5‑5

GB, IE

Installation and maintenance instructions

Publisher/manufacturer
Vaillant GmbH

Berghauser Str. 40 D-42859 Remscheid
Tel. [phone]‑0 Fax [phone]‑2810
[e-mail] www.vaillant.de

Contents

2 Installation and maintenance instructions ecoTEC plus 0020134823_04

Contents

1 Safety .................................................................... 4

1.1 Action-related warnings ......................................... 4

1.2 Intended use.......................................................... 4

1.3 General safety information .................................... 4

1.4 Regulations (directives, laws, standards).............. 6

2 Notes on the documentation .............................. 7

2.1 Observing other applicable documents ................. 7

2.2 Storing documents................................................. 7

2.3 Applicability of the instructions .............................. 7

2.4 Benchmark............................................................. 7

3 Product description............................................. 7

3.1 Design of the product............................................. 7

3.2 Information on the identification plate.................... 8

3.3 CE label ................................................................. 8

4 Installation............................................................ 8

4.1 Unpacking the product........................................... 8

4.2 Checking the scope of delivery.............................. 8

4.3 Product dimensions and connection

dimensions............................................................. 9

4.4 Minimum clearances and installation

clearances ............................................................. 9

4.5 Clearance from combustible components ............. 9

4.6 Using the installation template............................... 9

4.7 Wall-mounting the product................................... 10

4.8 Removing/installing the front casing.................... 10

4.9 Removing/fitting the upper casing ....................... 10

4.10 Removing/installing the side section (as

required) .............................................................. 11

5 Installation.......................................................... 11

5.1 Gas installation .................................................... 11

5.2 Hydraulics installation.......................................... 12

5.3 Flue gas installation ............................................. 14

5.4 Electrical installation ............................................ 15

6 Operation............................................................ 17

6.1 Operating concept of the product ........................ 17

6.2 Live Monitor (status codes) ................................. 17

6.3 Test programmes................................................. 17

7 Start-up ............................................................... 18

7.1 Auxiliary service equipment:................................ 18

7.2 Carrying out the initial start-up............................. 18

7.3 Checking and treating the heating water/filling

and supplementary water .................................... 18

7.4 Switching on the product ..................................... 19

7.5 Running the installation assistants ...................... 19

7.6 Restarting the installation assistants ................... 19

7.7 Calling up appliance config. and diagnostics

menu.................................................................... 19

7.8 Using check programmes.................................... 19

7.9 Reading off the filling pressure ............................ 20

7.10 Preventing low water pressure ............................ 20

7.11 Filling and purging the heating installation .......... 20

7.12 Flushing the heating installation for the first

time ("cold") ......................................................... 21

7.13 Filling the condensate trap .................................. 21

7.14 Checking and adjusting the gas ratio setting ....... 21

7.15 Checking leak-tightness ...................................... 24

7.16 Thoroughly flushing the heating installation

("hot")................................................................... 24

8 Adapting the unit to the heating

installation.......................................................... 25

8.1 Calling up diagnostics codes ............................... 25

8.2 Setting the heating partial load ............................ 25

8.3 Setting the pump overrun and pump operating

mode.................................................................... 25

8.4 Setting the maximum flow temperature ............... 25

8.5 Setting the return flow temperature control ......... 25

8.6 Burner anti-cycling time ....................................... 26

8.7 Setting the maintenance interval ......................... 26

8.8 Setting the pump output....................................... 26

8.9 Handing the product over to the operator............ 26

9 Inspection and maintenance ............................ 26

9.1 Observing inspection and maintenance

intervals ............................................................... 27

9.2 Procuring spare parts .......................................... 27

9.3 Using the function menu...................................... 27

9.4 Carrying out electronics self-tests ....................... 28

9.5 Removing the gas-air mixture unit....................... 28

9.6 Cleaning the heat exchanger............................... 29

9.7 Checking the burner ............................................ 30

9.8 Replacing the ignition and ionisation

electrodes ............................................................ 30

9.9 Cleaning the condensate trap.............................. 30

9.10 Installing the gas-air mixture unit ......................... 30

9.11 Draining the product ............................................ 31

9.12 Completing inspection and maintenance work .... 31

10 Troubleshooting ................................................ 31

10.1 Contacting your service partner........................... 32

10.2 Calling up service messages ............................... 32

10.3 Reading off the fault codes .................................. 32

10.4 Querying the fault memory .................................. 32

10.5 Resetting the fault memory.................................. 32

10.6 Performing diagnostics ........................................ 32

10.7 Using check programmes .................................... 32

10.8 Resetting parameters to factory settings ............. 32

10.9 Preparing the repair work .................................... 32

10.10 Replacing defective components......................... 33

10.11 Completing repair work........................................ 35

11 Decommissioning.............................................. 35

11.1 Decommissioning the product ............................. 35

12 Recycling and disposal..................................... 35

13 Customer service............................................... 35

Appendix ............................................................................ 36

A Installer level menu structure – Overview....... 36

B Overview of diagnostics codes........................ 38

C Inspection and maintenance work –

Overview............................................................. 40

Contents

0020134823_04 ecoTEC plus Installation and maintenance instructions 3

D Status codes – Overview .................................. 41

E Overview of fault codes .................................... 42

F Connection diagram .......................................... 44

G Initial start-up checklist..................................... 45

G.1 Initial start-up checklist ........................................ 45

H Commissioning Checklist ................................. 48

I Opening of the flue pipe.................................... 51

I.1 Positioning of the opening of a fan-supported

flue gas guiding.................................................... 51

I.2 Text from BS 5440-1 on fan-supported flue

gas guiding .......................................................... 52

I.3 Opening of the flue pipe below eaves and

balconies.............................................................. 52

J Treating the heating water................................ 52

K Technical data.................................................... 53

Index ................................................................................... 55

1 Safety

4 Installation and maintenance instructions ecoTEC plus 0020134823_04

1 Safety

1.1 Action-related warnings

Classification of action-related warnings

The action-related warnings are classified in
accordance with the severity of the possible
danger using the following warning signs and
signal words:

Warning symbols and signal words

Danger!

Imminent danger to life or risk of
severe personal injury

Danger!

Risk of death from electric shock

Warning.

Risk of minor personal injury

Caution.

Risk of material or environmental
damage

1.2 Intended use

There is a risk of injury or death to the user or
others, or of damage to the product and other
property in the event of improper use or use
for which it is not intended.

The product is intended as a heat generator
for closed heating installations and for hot
water generation.

Depending on the gas-fired boiler type, the
products referred to in these instructions
must only be installed and operated in con­junction with the air/flue pipe accessories lis­ted in the other applicable documents.

Intended use includes the following:

– observance of accompanying operating,

installation and servicing instructions for
the product and any other system compon­ents

– installing and fitting the product in accord-

ance with the product and system approval

– compliance with all inspection and main-

tenance conditions listed in the instruc­tions.

Intended use also covers installation in ac­cordance with the IP class.

Any other use that is not specified in these
instructions, or use beyond that specified in

this document shall be considered improper
use. Any direct commercial or industrial use
is also deemed to be improper.

Caution.

Improper use of any kind is prohibited.

1.3 General safety information

1.3.1 Risk caused by inadequate
qualifications

The following work must only be carried out
by competent persons who are sufficiently
qualified to do so:

– Installation
– Disassembly
– Installation
– Start-up
– Maintenance
– Repair
– Decommissioning

1.3.2 Risk of death due to blocked or
leaking flue gas routes

Installation errors, damage, tampering, unau­thorised installation sites or similar can cause
flue gas to escape and result in a risk of pois­oning.

What to do if you smell flue gas in the prop­erty:

▶ Open all accessible doors and windows

fully to provide ventilation.

▶ Switch off the product.
▶ Check the flue gas routes in the product

and the flue gas diversions.

1.3.3 Risk of poisoning and burns caused
by escaping hot flue gases

▶ Only operate the product if the air/flue pipe

has been completely installed.

▶ With the exception of short periods for

testing purposes, only operate the product
when the front casing is installed and
closed.

1.3.4 Risk of death due to explosive and
flammable materials

▶ Do not use or store explosive or flammable

materials (e.g. petrol, paper, paint) in the
installation room of the product.

Safety 1

0020134823_04 ecoTEC plus Installation and maintenance instructions 5

1.3.5 Danger caused by improper
operation

Improper operation may present a danger to
you and others, and cause material damage.

▶ Carefully read the enclosed instructions

and all other applicable documents, par­ticularly the "Safety" section and the warn­ings.

▶ Only carry out the activities for which in-

structions are provided in these operating
instructions.

1.3.6 Risk of death from escaping gas

What to do if you smell gas in the building:

▶ Avoid rooms that smell of gas.
▶ If possible, open doors and windows fully

and ensure adequate ventilation.

▶ Do not use naked flames (e.g. lighters,

matches).

▶ Do not smoke.
▶ Do not use any electrical switches, mains

plugs, doorbells, telephones or other com­munication systems in the building.

▶ If it is safe to do so, close the emergency

control valve or the main isolator.

▶ If possible, close the gas isolator cock on

the product.

▶ Warn other occupants in the building by

yelling or banging on doors or walls.

▶ Leave the building immediately and ensure

that others do not enter the building.

▶ Notify the gas supply company or the Na-

tional Grid [phone] by tele­phone once you are outside of the build­ing.

1.3.7 Risk of death due to lack of safety
devices

The schematic drawings included in this doc­ument do not show all safety devices re­quired for correct installation.

▶ Install the necessary safety devices in the

system.

▶ Observe the applicable national and inter-

national laws, standards and guidelines.

1.3.8 Risk of injury during transport due
to a high product weight.

▶ Make sure that the product is transported

by at least two people.

1.3.9 Risk of death from electric shock

There is a risk of death from electric shock if
you touch live components.

Before commencing work on the product:

▶ Disconnect the product from the power

supply by switching off all power supplies
(electrical partition with a contact opening
of at least 3 mm, e.g. fuse or line protec­tion switch).

▶ Secure against being switched back on

again.

▶ Wait for at least 3 minutes until the capa-

citors have discharged.

▶ Check that there is no voltage.

1.3.10 Risk of being burned or scalded by

hot components

▶ Only carry out work on these components

once they have cooled down.

1.3.11 Risk of death from escaping flue

gas

If you operate the product with an empty con­densate siphon, flue gas may escape into the
room air.

▶ In order to operate the product, ensure that

the condensate siphon is always full.

1.3.12 Risk of scalding from hot water

There is a risk of scalding at the hot water
draw-off points if the hot water temperatures
are greater than 60 °C. Young children and
elderly persons are particularly at risk, even
at lower temperatures.

▶ Select a moderate set target temperature.

1.3.13 Risk of material damage caused by

using an unsuitable tool

▶ Use the correct tool to tighten or loosen

screw connections.

1 Safety

6 Installation and maintenance instructions ecoTEC plus 0020134823_04

1.3.14 Risk of material damage caused by
frost

▶ Do not install the product in rooms prone

to frost.

1.3.15 Risk of corrosion damage due to
unsuitable combustion and room
air

Sprays, solvents, chlorinated cleaning
agents, paint, adhesives, ammonia com­pounds, dust or similar substances may lead
to corrosion on the product and in the air/flue
pipe.

▶ Ensure that the supply of combustion air is

always free of fluorine, chlorine, sulphur,
dust, etc.

▶ Ensure that no chemical substances are

stored at the installation site.

▶ If you are installing the product in

hairdressing salons, painter's or joiner's
workshops, cleaning businesses or similar
locations, choose a separate installation
room in which the room air is technically
free of chemical substances.

1.4 Regulations (directives, laws,

standards)

▶ Observe the national regulations, stand-

ards, guidelines and laws.

Notes on the documentation 2

0020134823_04 ecoTEC plus Installation and maintenance instructions 7

2 Notes on the documentation

2.1 Observing other applicable documents

▶ You must observe all the operating and installation in-

structions included with the system components.

2.2 Storing documents

▶ Pass these instructions and all other applicable docu-

ments on to the system operator.

2.3 Applicability of the instructions

These instructions apply only to:

Product article number

Article num­ber

Gas Council
Number

806 (VU GB 806/5‑5)

0010010767 41-044-68

1006 (VU GB 1006/5‑5)

0010010780 41-044-69

1206 (VU GB 1206/5‑5)

0010010791 41-044-70

2.4 Benchmark

Vaillant is a licensed member of the Benchmark Scheme.

Benchmark places responsibilities on both manufacturers
and installers. The purpose is to ensure that customers are
provided with the correct equipment for their needs, that it is
installed, commissioned and serviced in accordance with the
manufacturer’s instructions by a competent person approved
at the time by the Health and Safety Executive and that it
meets the requirements of the appropriate Building Regu­lations. The Benchmark Checklist can be used to demon­strate compliance with Building Regulations and should be
provided to the customer for future reference.

Installers are required to carry out installation, commission­ing and servicing work in accordance with the Benchmark
Code of Practice which is available from the Heating and
Hotwater Industry Council who manage and promote the
Scheme.

Benchmark is managed and promoted by the Heating and
Hotwater Industry Council.

For more information visit www.centralheating.co.uk

3 Product description

3.1 Design of the product

3.1.1 Functional elements (806/5‑5)

1

2

3

4

6

5

7

8

10

9

12

13

14

15

16

11

1 Connection for the flue

pipe

2 Fan

3 Gas valve

4 Connection for air in-

take pipe

5 Flue gas pressure

cartridge

6 Return temperature

sensor

7 Water pressure sensor

8 Electronics box

9 Integrated condensation

heat exchanger

10 Pressure gauge

11 Flow temperature

sensor

12 Safety overheat cut-off

device

13 Ignition electrode

14 Automatic air vent

15 Monitoring electrode

4 Installation

8 Installation and maintenance instructions ecoTEC plus 0020134823_04

3.1.2 Functional element (1006/5‑5 and 1206/5‑5)

1

2

3

6

7

5

4

8

10

9

12

13

14

15

16

11

1 Connection for the flue

pipe

2 Fan

3 Gas valve

4 Supply air connector

5 Flue gas pressure

cartridge

6 Return temperature

sensor

7 Water pressure sensor

8 Electronics box

9 Integrated condensation

heat exchanger

10 Pressure gauge

11 Flow temperature

sensor

12 Safety overheat cut-off

device

13 Ignition electrode

14 Automatic air vent

15 Monitoring electrode

3.2 Information on the identification plate

The identification plate is mounted on the underside of the
product in the factory.

Information on the
identification plate

Meaning

Serial number for identification; 7th to 16th digits =

product article number

VU… Vaillant gas-fired wall-hung boiler for

heating

ecoTEC plus Product description

H, G20 – 20 mbar
(2.0 kPa)

Gas group and gas connection pressure
as set at the factory

Cat. (e.g. II

2H3P

) Unit category

Types (e.g. C33) Gas-fired boiler types

PMS (e.g. 6 bar
(0.6 MPa))

Permissible total overpressure

T

max.

(e.g. 85 °C) Max. flow temperature

230 V 50 Hz Electric connection

Information on the
identification plate

Meaning

(e.g. 260) W Max. electrical power consumption

IP (e.g. X4D) Level of protection

Heating mode

P Nominal heat output range

Q Heat input range

Note

Make absolutely sure that the product is compat­ible with the gas group at the installation site.

3.3 CE label

The CE label shows that the products comply with the basic
requirements of the applicable directives as stated on the
identification plate.

The declaration of conformity can be viewed at the manufac­turer's site.

4 Installation

4.1 Unpacking the product

1. Remove the product from its box.

2. Remove the protective film from all parts of the product.

4.2 Checking the scope of delivery

▶ Check that the scope of delivery is complete and intact.

4.2.1 Scope of delivery

Num­ber

Description

1

Hanging bracket

1

Heat generator

1

Condensate trap

1 Condensate drain hose

1

Installation template

1

Enclosed documentation

1

Enclosed unit fastening

1

Bag with small parts

1

Gas connection piece

1

Service valve (1 1/2 inches), red handle

1

Service valve (1 1/2 inches), blue handle

1

Bag with seals for service valves

1

Expansion relief valve, 6 bar

1

R 1 straight-through gas valve

Installation 4

0020134823_04 ecoTEC plus Installation and maintenance instructions 9

4.3 Product dimensions and connection
dimensions

287

190

673

603

480

175

138

172 172

70

22

482

Ø25

49

G 1 1/4

960

477

680,5

1

2

3

4

5

6

7

1 Wall duct for flue pipe

2 Flue pipe connection

3 Hanging bracket

4 Heating flow

5 Condensate trap con-

nection

6 Gas connection

7 Heating return

4.4 Minimum clearances and installation
clearances

CC

AB

A 350 mm (110/160 mm

diameter flue pipe)

At least 450 mm for
cascade design

B 400 mm

C Optional approx. 200

mm

D Clearance of 600 mm

in front of the product
for easy access during
maintenance work

▶ When using the accessories, observe the minimum clear-

ances/installation clearances.

Note

A lateral clearance is not required, however
you can also remove the side sections if there
is sufficient space at the side (approx. 200
mm) in order to facilitate maintenance or re­pair work.

▶ Where units are installed in cascade, observe the gradi-

ent of the flue pipe (approx. 50 mm/m).

4.5 Clearance from combustible components

It is not necessary to ensure that there is a clearance
between the product and combustible components, as the
temperature of the product will never exceed the maximum
permissible temperature of 85 °C at its nominal heat output.
The same applies to the external air guiding of the concentric
flue pipe.

4.6 Using the installation template

1. Position the installation template vertically over the in-

stallation site.

2. Secure the template to the wall.

3. Mark on the wall all the points required for your installa-

tion.

4. Remove the installation template from the wall.

5. Drill all the holes required.

6. Make any perforations necessary.

4 Installation

10 Installation and maintenance instructions ecoTEC plus 0020134823_04

4.7 Wall-mounting the product

Conditions: The load-bearing capacity of the wall is sufficient, The fixing

material may be used for the wall

▶ Wall-mount the product as described.

Conditions: The load-bearing capacity of the wall is not sufficient

▶ Ensure that wall-mounting apparatus on-site has a suf-

ficient load-bearing capacity. Use individual stands or
primary walling, for example.

▶ Do not wall-mount the product if you cannot provide

wall-mounting apparatus with a sufficient load-bearing
capacity.

Conditions: The fixing material may not be used for the wall

▶ Wall-mount the product as described using the permitted

fixing material provided on-site.

1

1. Install the hanging bracket (1) on the wall.

2. Suspend the product on the hanging bracket from
above using the suspension bracket.

4.8 Removing/installing the front casing

4.8.1 Removing the front casing

2

1

1. Undo the bolt (1).

2. Push in both retaining clips (2) so that the front casing
is released.

3. Pull the front casing forwards at the bottom edge.

4. Lift the front casing upwards from the bracket.

4.8.2 Installing the front casing

1. Place the front casing on the upper brackets.

2. Push the front casing onto the product until both retain­ing clips (2) snap into place at the front casing.

3. Secure the front casing by tightening the bolt (1).

4.9 Removing/fitting the upper casing

4.9.1 Removing the upper casing

2

1

1. Unscrew the screws (2).

2. Pull out the upper casing (1) towards the front.

4.9.2 Installing the upper casing

1. From above, place the upper casing (1) on the product.

2. Use the screws (2) to secure the upper casing (1).

Installation 5

0020134823_04 ecoTEC plus Installation and maintenance instructions 11

4.10 Removing/installing the side section (as
required)

4.10.1 Removing the side section

Caution.
Risk of material damage caused by mech-

anical deformation.

Removing both side sections may cause
mechanical distortion in the product, which
may cause damage to the piping, for ex­ample, and potentially result in leaks.

▶ Always remove only one side section –

never both side sections at the same time.

1. Tilt the electronics box forward.

2. Remove the upper casing. (→ Page 10)

3. Hold on to the side section so that it cannot fall, and

unscrew the lower front and upper central screws from
the side section.

4. Tilt the side section slightly to the side and pull it out

towards the front.

4.10.2 Installing the side section

1. Push the side section into the bracket. When doing so,

and to prevent leaks, ensure that all straps on the side
section engage with the back wall.

2. Slide the side section to the rear.

3. Secure the side section using two screws in the front

lower area and in the upper central area.

4. Install the upper casing. (→ Page 10)

5. Fold up the electronics box.

5 Installation

Danger!
Risk of explosion or scalding caused by

incorrect installation.

Stresses in the supply line can cause leaks.

▶ Make sure there is no voltage in the sup-

ply lines when they are installed.

Caution.
Risk of damage caused by contaminated

lines.

Foreign bodies, such as welding remnants,
sealing residue or dirt in the water pipes, may
cause damage to the boiler.

▶ Flush the heating installation thoroughly

prior to installation.

Seals made of rubber-like materials may be subject to plastic
deformation, which can lead to pressure losses. We recom­mend using seals made of a paste-like fibre material.

5.1 Gas installation

5.1.1 Performing the gas installation

Caution.
Risk of material damage caused by incor-

rect gas installation.

Excessive test pressure may cause damage
to the gas valve.

▶ When checking the entire gas installation

for leak-tightness, the maximum permiss­ible pressure at the gas valve is 7.5 kPa
(75 mbar).

Caution.
Risk of material damage caused by the

incorrect gas type.

Using the wrong gas type may cause a fault
shutdown of the product. Furthermore, igni­tion and combustion noise may occur in the
product.

▶ Only use the gas types in accordance with

the identification plate.

5 Installation

12 Installation and maintenance instructions ecoTEC plus 0020134823_04

▶ Remove the residues from the gas line by blowing

through the gas line beforehand.

▶ Make sure that the existing gas meter is capable of

passing the rate of gas supply required.

▶ Install an approved gas isolator cock on the product us-

ing the gas connection piece.

▶ Install the gas line on the gas isolator cock without ten-

sion.

▶ Purge the gas line before start-up.
▶ Check that the gas connection is leak-tight (→ Page 24).

5.2 Hydraulics installation

Caution.
Risk of material damage due to high tem-

peratures.

Plastic pipes in the heating installation may
become damaged by overheating if a fault
occurs.

▶ When using plastic pipes, install a max-

imum thermostat on the heating flow.

Caution.
Risk of material damage due to corrosion.

If non-diffusion-tight plastic pipes are used in
the heating installation, this may cause air to
enter the heating water and lead to corrosion
of the heat generation circuit and the product.

▶ If using non-diffusion-tight plastic pipes

in the heating installation, separate the
system by installing an external heat ex­changer between the product and the
heating installation.

Caution.
Risk of material damage due to heat trans-

fer during soldering.

▶ Only solder connection pieces if the con-

nection pieces are not yet screwed to the
service valves.

The product should be connected using a Vaillant pump
group (accessories).

– Modulating pump

This pump group has a connection option for an expansion
vessel (right-hand connection) and an expansion relief valve
(left-hand connection). You can find information about avail­able accessories from the Vaillant price list or from the con­tact address provided on the reverse of this document.

▶ When installing the pump group, observe the installa-

tion sequence for the insulation and the hydraulic pipes (
Pump group installation instructions).

▶ Note that the boiler pump must always be fitted in the

return line. Otherwise, this may lead to a malfunction in
the product.

When connecting several products in cascade operation, you
must install a non-return flap from the cascade connection
set in the flow line of each individual product.

A non-return flap from a third-party manufacturer must have
no more than 30 mbar pressure loss for a volume flow of

4.5 m³/h.

5.2.1 Connecting the heating flow and heating
return

1

1. In each case, insert a flat seal into the service valve

(Vaillant accessories).

2. Screw the service valves onto the flow and return con-

nection (1) of the pump group.

3. Screw the service valves to the customer's installation.

– Diameter of the heating line: 1 1/4″

Installation 5

0020134823_04 ecoTEC plus Installation and maintenance instructions 13

5.2.2 Installing an expansion vessel

1

▶ Install an expansion vessel on the connection (1) in the

return.
– Connection to the pump group: 1/2″

Conditions: Using a system separation

– Large expansion vessel: ≥ 10 l

5.2.3 Hydraulic connection

Ø 1 1/4"

For the hydraulic connection to the heating installation, we
strongly recommend that you use a low loss header or a
plate heat exchanger for the hydraulic system partition. In
addition, we recommend that you install a dirt filter in the
system before the low loss header or the plate heat ex­changer. For the maintenance of the plate heat exchanger,
we recommend that you install cleaning connections on
the heating side so that the plate heat exchanger can be
backwashed during maintenance work.

To this end, various plate heat exchangers and low loss
headers are available as accessories, depending on the out­put of a product or the cascade system. The pressure loss is
adjusted to the pump groups that are offered as an access­ory. The minimum volume of circulating water is guaranteed
in the unit circuit thanks to the original accessories, provided
the maximum pressure losses are not exceeded in the pip­ing.

Select the plate heat exchanger according to output.

Depending on your choice of pump group, the following re­maining feed heads are available in the unit supply:

Power Description Remaining feed

head

80 kW Modulating pump 0.042 MPa

(0.420 bar)

100 kW Modulating pump 0.026 MPa

(0.260 bar)

120 kW Modulating pump 0.024 MPa

(0.240 bar)

If you are using a plate heat exchanger to hydraulically parti­tion the system, the following pressure losses must be main­tained (rated water volume when ΔT=20 K):

Power Pressure loss

< 120 kW 86 mbar

(0.086 bar)

In conjunction with the hydraulic cascade

< 240 kW 96 mbar

(0.096 bar)

< 360 kW 76 mbar

(0.076 bar)

< 480 kW 82 mbar

(0.082 bar)

< 600 kW 87 mbar

(0.087 bar)

< 720 kW 92 mbar

(0.092 bar)

5.2.4 Connecting the condensate trap

Condensate forms in the product during combustion. The
condensate drain pipework routes the condensate to the
waste water connection.

The product is equipped with a condensate trap. The filling
height is 145 mm. The condensate trap collects any con­densate that forms and feeds it into the condensate drain
pipework.

▶ Place the condensate trap on the underside of the

product on the condensate drain pipe and secure it using
the retaining clips.

▶ Leave installation space of at least 180 mm below the

condensate trap so that you can clean the condensate
trap in the event of maintenance work.

▶ Check the connection for leak-tightness.

5 Installation

14 Installation and maintenance instructions ecoTEC plus 0020134823_04

5.2.5 Connecting the condensate drain pipework

min.

180

2

1

3

▶ When making the condensate pipe connections ensure

that there is adequate branch ventilation and that there
can be no backflow of water into the boiler via the con­densate pipe work.

▶ Check if a neutralising unit is required in accordance with

national regulations.

▶ Observe the local regulations on neutralising the con-

densate.

Note

You can obtain neutralisation with or without a
condensate pump as an accessory.

▶ If required, guide the drain hose (1) from the automatic

air vent into the tundish.

Note

The condensate drain pipework must have a
continuous fall (45 mm per metre) and should
whenever possible terminate at a suitable
drain point within the heated envelope of the
building that will remain frost free under long
periods of low external temperatures.

You can find further information in BS 656: "Specification for
installing and maintaining gas-fired boilers with a nominal
heat loading greater than 70 kW but less than or equal to
300 kW". Before the boiler is started up, the condensate
trap (1) must be filled with water as described in the relevant
section.

5.2.6 Connecting the expansion relief valve

Note

The product is delivered with a 6 bar expansion
relief valve, which must be installed on the
product and must be guided to a secure, but vis­ible, point. The discharge pipe on the expansion
relief valve must have a minimum diameter of 18
mm and must only be used for this purpose.

1. Ensure that all components that are installed in the

heating installation are suitable for a max. operating
pressure of 6 bar.

1

Danger!
Risk of scalding!

Heating water that leaks from the exit point of
the expansion relief valve may cause severe
burns.

▶ Install the expansion relief valve drain to a

professional standard.

2. Connect the expansion relief valve (1).

Note

When selecting the expansion relief valve,
note the max. operating pressure of the heat­ing installation.

5.3 Flue gas installation

5.3.1 Air/flue pipes that can be connected

▶ When installing the air/flue pipe, observe the provisions

of the applicable national regulations.

Note

All products feature an 110/160 mm diameter
air/flue gas connection as standard.

You can find out which air/flue pipes may be used by con­sulting the enclosed "Air/flue pipe installation manual".

5.3.2 Installing the air/flue pipe

Caution.
Risk of poisoning due to escaping flue

gas.

Mineral-oil-based greases can damage the
seals.

▶ Instead of grease, use only water or com-

mercially available soft soap to aid install­ation.

Installation 5

0020134823_04 ecoTEC plus Installation and maintenance instructions 15

Danger!
Risk of personal injury and material dam-

age due to unapproved air/flue pipes.

Vaillant boilers are certified only with Vaillant
original air/flue pipes. The use of other ac­cessories may cause personal injury and ma­terial damage, as well as operating faults. For
installation type B23P, third-party accessor­ies are also permitted (see the technical data
in the appendix).

▶ Only use Vaillant original air/flue pipes.
▶ If third-party accessories are permitted

for B23P, ensure that the flue pipe con­nections are properly routed, sealed and
secured against slipping out.

1. Install the flue pipe using the installation manual.

2. When installing the air/flue pipe, observe the provisions
of the applicable national regulations.

3. Route the flue pipe with a downward gradient so that
the condensate that accumulates can easily flow into
the condensate trap provided for it.

5.4 Electrical installation

5.4.1 Opening/closing the electronics box

5.4.1.1 Opening the electronics box

2

1

3

1. Remove the front casing. (→ Page 10)

2. Tilt the electronics box (1) forward.

3. Undo the clips (3) from the brackets.

4. Fold up the cover (2).

5.4.1.2 Closing the electronics box

1. Close the cover (2) by pushing downwards on the elec­tronics box (1).

2. Ensure that all the clips (3) audibly click into the brack­ets.

3. Tilt the electronics box upwards.

5.4.2 Establishing the power supply

Caution.
Risk of material damage due to high con-

nected voltage.

At mains voltages greater than 253 V, elec­tronic components may be damaged.

▶ Ensure that the rated voltage of the mains

is 230 V (+10%/-15%) ~ 50 Hz.

1. Observe all valid regulations.

2. Open the electronics box. (→ Page 15)

3. Provide one common electricity supply for the boiler
and for the corresponding controller:

– Power supply: Single-phase, 230 V, 50 Hz
– Fuse protection: ≤ 3 A

4. Connect the product using a fixed connection and a
partition with a contact opening of at least 3 mm (e.g.
fuses or power switches).

5. Use a flexible line for the mains feed line, which is
routed through the cable duct into the product.

6. Carry out the wiring. (→ Page 16)

7. Observe the connection diagram (→ Page 44).

8. Screw the supplied ProE plug to a suitable, flexible
three-core mains connection cable which complies with
the relevant standards.

9. Close the electronics box. (→ Page 15)

10. Make sure that access to the mains connection is al-

ways available and is not covered or blocked.

5 Installation

16 Installation and maintenance instructions ecoTEC plus 0020134823_04

5.4.3 Carrying out the wiring

Caution.
Risk of material damage caused by incor-

rect installation.

Mains voltage at the incorrect plug terminals
on the ProE system may destroy the elec­tronics.

▶ Do not connect any mains voltage to the

eBUS terminals (+/-).

▶ Only connect the mains connection cable

to the terminals marked for the purpose.

1. Route the supply lines of the components to be connec­ted through the cable duct provided on the underside of
the product.

2. Use the strain reliefs provided.

3. Shorten the supply lines as necessary.

4. To prevent short circuits if a strand accidentally comes
loose, only strip the outer sheathing of flexible lines to a
maximum of 30 mm.

5. Ensure the inner conductor insulation is not damaged
when stripping the outer sheathing.

6. Only strip inner conductors just enough to establish
good, sound connections.

7. To avoid short circuits resulting from loose individual
wires, fit conductor end sleeves on the stripped ends of
the conductors.

8. Screw the respective ProE plug to the supply line.

9. Check whether all conductors are sitting mechanically
securely in the terminals of the ProE plug. Remedy this
if necessary.

10. Plug the ProE plug into the associated PCB slot.

11. Secure the cable in the electronics box using the strain

reliefs.

5.4.4 Connecting the pump group

X18

230 V

X22

1. Open the electronics box. (→ Page 15)

2. Carry out the wiring. (→ Page 16)

3. Use the strain reliefs provided.

4. Plug the ProE plug for the mains power cable into slot
X18.

5. Plug the ProE plug for the control cable into slot X22.

6. Close the electronics box. (→ Page 15)

5.4.5 Installing the controller

▶ Install the controller if necessary.

5.4.6 Connecting controllers to the electronic

system

1. Open the electronics box. (→ Page 15)

2. Carry out the wiring. (→ Page 16)

3. If you connect a weather compensator or room thermo­stat to the product via eBUS, bridge the input 24 V = RT
(X100 or X106) if no bridge exists.

4. If you use a low-voltage controller (24 V), connect this
instead of the bridge 24 V = RT (X100 or X106).

5. When connecting a maximum thermostat (contact ther­mostat) for underfloor heating, connect this instead of
the bridge (Burner off) at the ProE plug.

6. Close the electronics box. (→ Page 15)

7. In order to achieve the Comfort pump operating mode
(continuously running pump) for multi-circuit controllers,
change D.018 Pump operating mode (→ Page 25) from
Eco (intermittent pump) to Comfort.

8. If a system separation is installed, set the pump to
Comfort D.018 and set the pump output to at least
4 (85%, D.014). This also applies for installing in
cascade.

Operation 6

0020134823_04 ecoTEC plus Installation and maintenance instructions 17

5.4.7 Connecting additional components

You can use the multi-functional module to actuate two addi­tional components.

The following components can be actuated:

– Circulation pump
– External pump
– Cylinder charge pump
– Extractor hood
– External solenoid valve
– External fault signal
– Solar pump (not active)
– eBUS remote control (not active)
– Legionella protection pump (not active)
– Solar valve (not active).

5.4.7.1 Using the VR 40 ("2 in 7" multi-functional
module)

1. Install the components in accordance with the respect-

ive instructions.

2. Select D.027 (→ Page 25) to actuate relay 1 on the

multi-functional module.

3. Select D.028 (→ Page 25) to actuate relay 2 on the

multi-functional module.

5.4.7.2 Using the flue non-return flap

For cascade operation, you must provide a flue non-return
flap for each product. Either use only electrical flue non-re­turn flaps or use only mechanical flue non-return flaps for all
products in a cascade.

The electrical flue non-return flap is actuated by the VR 40
multi-functional module. The installation instructions for the
VR 40 describe how the flue non-return flap is activated. The
mechanical flue non-return flap has an integrated siphon,
which must be filled with water before starting up the unit.

You can omit the flue non-return flap if you can ensure that
the flue gas installation is operated completely under negat­ive pressure.

Conditions: Operating with natural gas

▶ For smooth operation with natural gas and a flue non-

return flap, use diagnostics code D.050 (→ Page 25) to
increase the fan speed in partial load operation to 1500
rpm.

Conditions: Operating with liquid gas

▶ You must never raise the speed under D.050

(→ Page 25) any higher because a higher speed is
already being used when operating with liquid gas.

5.4.8 Actuating the circulation pump according
to requirements

1. Connect the wiring in the same way as described

in "Connecting controllers to the electronic system
(→ Page 16)".

2. Connect the supply line for the external button using

terminals 1 (0) and 6 (functional drawing) on the X41
edge connector, which is supplied with the controller.

3. Plug the edge connector into the PCB slot X41.

6 Operation

6.1 Operating concept of the product

The operating concept and the read-off and setting facilities
of the operator level are described in the operating instruc­tions.

An overview of the read-off and setting facilities of the in­staller level can be found in the section "Overview of the
menu structure – Installer level" (→ Page 36).

6.1.1 Calling up the installer level

Caution.
Risk of material damage caused by incor-

rect handling.

Incorrect settings at installer level may cause
damage and operating faults to the heating
installation.

▶ You must only access the installer level if

you are an approved competent person.

Note

The installer level is protected against unauthor­ised access using a password.

1.

Press and ("i") simultaneously.

◁ The following menu appears in the display.

2.

Scroll using the or button, until the menu point
Installer level appears.

3. Press (OK) to confirm your selection.

◁ In the display, the text Enter code appears along

with the value 00.

4.

Use or to set the value 17 (code).

5. Press (OK) to confirm your selection.

◁ The installer level appears with a selection of menu

points.

6.2 Live Monitor (status codes)

Menu → Live Monitor

Status codes in the display provide information on the pro­duct's current operating status.

Status codes – Overview (→ Page 41)

6.3 Test programmes

As well as the installation assistants, you can also call up the
test programmes for start-up, service and troubleshooting.

Menu → Installer level Test programs

There you will find the Check programs (→ Page 19), in
addition to the Function menu, an Electronics self-test
and the Gas family check.

7 Start-up

18 Installation and maintenance instructions ecoTEC plus 0020134823_04

7 Start-up

7.1 Auxiliary service equipment:

The following test and measuring equipment is required for
start-up:

– CO2measuring instrument
– Digital or U tube manometer
– Flat blade screwdriver, small
– 2.5 mm Allen key

7.2 Carrying out the initial start-up

Initial start-up must be carried out by a customer service
technician or an authorised competent person using the
first-commissioning-checklist and the start-up checklist.
The first-commissioning-checklist and the start-up checklist
(→ Page 48) in the appendix for the installation instructions
must be filled out and stored carefully along with the product
documentation.

Initial start-up checklist (→ Page 45)

▶ Carry out the initial start-up using the checklist and the

start-up checklist in the appendix.

▶ Fill out and sign the checklists.

7.3 Checking and treating the heating
water/filling and supplementary water

Caution.
Risk of material damage due to poor-qual-

ity heating water

▶ Ensure that the heating water is of suffi-

cient quality.

▶ Before filling or topping up the system, check the quality

of the heating water.

Checking the quality of the heating water

▶ Remove a little water from the heating circuit.
▶ Check the appearance of the heating water.
▶ If you ascertain that it contains sedimentary materials,

you must desludge the system.

▶ Use a magnetic rod to check whether it contains mag-

netite (iron oxide).

▶ If you ascertain that it contains magnetite, clean the sys-

tem and apply suitable corrosion-protection measures, or
fit a magnet filter.

▶ Check the pH value of the removed water at 25 °C.
▶ If the value is below 8.2 or above 10.0, clean the system

and treat the heating water.

▶ Ensure that oxygen cannot get into the heating water.

Checking the filling and supplementary water

▶ Before filling the system, measure the hardness of the

filling and supplementary water.

Treating the filling and supplementary water

▶ Observe all applicable national regulations and technical

standards when treating the filling and supplementary
water.

Provided the national regulations and technical standards
do not stipulate more stringent requirements, the following
applies:

You must treat the heating water in the following cases:

– If the entire filling and supplementary water quantity dur-

ing the operating life of the system exceeds three times
the nominal volume of the heating installation, or

– If the guideline values listed in the following table are not

met, or

– If the pH value of the heating water is less than 8.2 or

more than 10.0.

Total
heating
output

Water hardness at specific system volume

1)

≤ 20 l/kW

> 20 l/kW
≤ 50 l/kW

> 50 l/kW

kW

ppm

CaCO₃

mol/m³ppm

CaCO₃

mol/m³ppm

CaCO₃

mol/

m³

< 50 < 300 < 3 200 2 2 0.02

> 50
to ≤ 200

200 2 150 1.5 2 0.02

> 200
to ≤ 600

150 1.5 2 0.02 2 0.02

> 600 2 0.02 2 0.02 2 0.02

1) Nominal capacity in litres/heating output; in the case of multi­boiler systems, the smallest single heating output is to be used.

Caution.
Risk of material damage if the heating

water is treated with unsuitable additives.

Unsuitable additives may cause changes in
the components, noises in heating mode and
possibly subsequent damage.

▶ Do not use any unsuitable frost and cor-

rosion protection agents, biocides or seal­ants.

No incompatibility with our products has been detected to
date with proper use of the following additives.

▶ When using additives, follow the manufacturer's instruc-

tions without exception.

We accept no liability for the compatibility of any additive or
its effectiveness in the rest of the heating system.

Additives for cleaning measures (subsequent
flushing required)

– Fernox F3
– Sentinel X 300
– Sentinel X 400

Additives intended to remain permanently in the
system

– Fernox F1
– Fernox F2
– Sentinel X 100
– Sentinel X 200

Additives for frost protection intended to remain
permanently in the system

– Fernox Antifreeze Alphi 11
– Sentinel X 500

▶ If you have used the above-mentioned additives, inform

the operator about the measures that are required.

Start-up 7

0020134823_04 ecoTEC plus Installation and maintenance instructions 19

▶ Inform the operator about the measures required for frost

protection.

7.4 Switching on the product

▶ Press the on/off button on the product.

◁ The basic display appears on the display.

7.5 Running the installation assistants

The installation assistant is displayed whenever the product
is switched on until it has been successfully completed.
It provides direct access to the most important check
programmes and configuration settings for starting up the
product.

Confirm the launch of the installation assistant. All heating
and hot water requests are blocked whilst the installation
assistant is active.

Confirm that you want to navigate to the next point by press­ing Next.

If you do not confirm the launch of the installation assistant,
it is closed 10 seconds after you switch on the unit and the
basic display then appears.

7.5.1 Language

▶ Set the required language.
▶ Press (OK) twice to confirm the set language and to

avoid unintentionally changing it.

If you have unintentionally set a language that you do not
understand, proceed as follows to change it:

▶

Simultaneously press and hold and .

▶ Also press the fault clearance key for a short time.
▶

Press and hold and until the display shows the
language setting option.

▶ Select the required language.
▶ Confirm this change by pressing (OK) twice.

7.5.2 Filling mode

Filling mode (check programme P.06) is activated automatic­ally in the installation assistant for as long as the filling mode
appears on the display.

7.5.3 Purging

1. Unlike in the check programmes menu, to purge the
system, start up the check programme P.00 by pressing

or .

2. If you need to change the circuit that is being purged,
press .

7.5.4 Target feed temperature, hot water

temperature, Comfort mode

1. To set the target feed temperature, hot water temperat­ure and Comfort mode, use the and buttons.

2. Confirm the setting by pressing (OK).

7.5.5 Heating partial load

The heating partial load of the product is set to Auto at
the factory. This means that the product independently
determines the optimum heating output depending on the

current heat demand of the system. The setting can also be
changed at a later point using D.000.

7.5.6 Auxiliary relay and multi-functional module

Additional components that are connected to the product can
be adjusted here. This setting can be changed using D.027
and D.028.

7.5.7 Telephone number for the competent
person

You can store your telephone number in the unit menu. The
operator can view the telephone number. The telephone
number can be up to 16 digits long and must not contain any
spaces.

7.5.8 Ending the installation assistant

Once the installation assistant has been completed and con­firmed, it will not start up automatically next time the unit is
switched on.

7.6 Restarting the installation assistants

You can restart the installation assistant at any time by call­ing it up in the menu.

Menu → Installer level → Start inst. assistant

7.7 Calling up appliance config. and
diagnostics menu

To recheck and reset the most important system parameters,
call up the Appliance config..

Menu → Installer level Appliance config.

The settings options for more complex systems can be found
in the Diagnostics menu.

Menu → Installer level Diagnostics menu

7.8 Using check programmes

Menu → Installer level → Test programs → Check pro­grams

By activating various check programmes, you can trigger
special functions on the product.

Display Meaning

P.00 Purging check programme:

The boiler circulation pump is cyclically actuated.

The heating circuit is purged via the automatic air
vent.

1 x : Start heating circuit purging

3 x ( ): Restart heating circuit purging

1 x (Cancel): End purge programme

Note

The purge programme runs for 7.5 min per circuit
and then terminates.

Purging the heating circuit:

Actuating the external pump for 15 cycles: 15 s on,
10 s off. Display: Active heating circuit.

P.01 Maximum load check programme:

After successful ignition, the product is operated at
maximum heat input.

7 Start-up

20 Installation and maintenance instructions ecoTEC plus 0020134823_04

Display Meaning

P.02 Minimum load check programme:

After successful ignition, the product is operated at
minimum heat input.

P.06 Filling mode check programme:

The burner and pump are switched off (to fill or drain
the product).

P.00 Purging

Cancel

Heating circuit

1,2 bar

Note

If the product is in error condition, you cannot start
any check programmes. You can detect an error
condition by the fault symbol shown in the left
bottom corner of the display. You must first reset.

To terminate the check programmes, you can press (Can-

cel) at any time.

7.9 Reading off the filling pressure

The product's supply pipe is equipped with an analogue
pressure gauge, a symbolic bar graph display and a digital
pressure gauge.

▶

To read off the digital filling pressure value, press the
button twice.

If the heating installation is full, in order to ensure that it op­erates smoothly, the indicator on the pressure gauge must
point to the upper half of the grey area or to the middle of the
bar graph display on the display (marked by the dashed limit
values) when the heating installation is cold. This corres­ponds to a filling pressure of between 0.1 MPa and 0.2 MPa
(1.0 bar and 2.0 bar).

If the heating installation extends over several storeys,
higher filling pressures may be required to avoid air entering
the heating installation.

7.10 Preventing low water pressure

To prevent damage to the heating installation that is caused
by low filling pressure, the product is fitted with a water
pressure sensor. If the filling pressure falls below 0.1 MPa
(1.0 bar), the product indicates low pressure by displaying a
flashing pressure value. If the filling pressure falls below 0.05
MPa (0.5 bar), the product switches off. The display shows
F.22.

▶ Top up the heating water to start the product up again.

The pressure value flashes in the display until a pressure of

0.11 MPa (1.1 bar) or higher has been reached.

▶ If you notice frequent drops in pressure, determine and

eliminate the cause.

7.11 Filling and purging the heating installation

1. Flush the heating installation thoroughly before filling it.

2. Select the check programme P.06.

◁ The pumps do not run and the product does not

enter heating mode.

3. Observe the information on the topic of treating

(→ Page 18) heating water.

4. Connect the filling and drainage tap in the heating in­stallation to a heating water supply, if possible with the
cold water valve, in accordance with the relevant stand­ards.

5. Open the heating water supply.

6. Open all thermostatic radiator valves.

7. If necessary, check that both service valves on the
product are open.

8. Slowly open the filling and drainage tap so that the wa­ter flows into the heating system.

Note

The product is equipped with an automatic
air vent. Other measures need to be taken
to allow the heating system to be purged
during filling and during commissioning either
manually or using an automatic air vent.

9. Open any available purging valves in the heating sys­tem.

10. Purge the lowest radiator until water flows out of the

purging valve without bubbles.

11. Purge all other radiators until the entire heating system

has been filled with water.

12. Close all purging valves.

13. Monitor the rising filling pressure in the heating installa-

tion.

14. Fill with water until the required filling pressure is

reached.

15. Close the filling and drainage tap and the cold water

valve.

16. To purge the heating installation, select the check pro-

gramme P.00.

◁ The product does not start up, the external pump

operates intermittently and purges either the heating
circuit or the hot water circuit. The display shows
the filling pressure of the heating installation.

17. To be able to carry out the purging process properly,

the heating installation filling pressure must not fall be­low the minimum filling pressure.

– Minimum heating installation filling pressure:

0.1 MPa (1.0 bar)

Note

The check programme P.00 runs for

7.5 minutes per circuit.
At the end of the filling procedure, the

filling pressure of the heating installation
should be at least 0.02 MPa (0.2 bar) above
the counter-pressure of the expansion
vessel ("Exp") (P

Installation

≥ P

Exp

+ 0.02 MPa

(0.2 bar)).

Start-up 7

0020134823_04 ecoTEC plus Installation and maintenance instructions 21

18. If there is still too much air in the heating installation at
the end of the check programme P.00, restart the check
programme.

19. Check all connections and the entire system for leak­tightness.

7.12 Flushing the heating installation for the first

time ("cold")

Note

The complete heating system must be flushed
at least twice: Once with cold water and once
with hot water in accordance with the following
instructions.

1. Check whether all thermostatic radiator valves and both

service valves on the product are open.

2. Connect a hose to the drain valve that is located at the

lowest position in the heating system.

3. Open the radiator valves and the drain valves so that

the water can drain quickly. Start at the next point in the
system and open the purging valves on the radiators so
that the contaminated water can completely drain.

4. Close the drain cocks.

5. Refill the heating system with water.

6. Check that the expansion relief valve of the heating

system is functioning correctly by turning the handle
on the valve.

7. Check the pressure in the heating system and top up

with water if necessary.

8. Close the filling valve and the cold water valve.

7.13 Filling the condensate trap

Danger!
Risk of poisoning due to escaping flue

gas.

An empty or insufficiently filled condensate
trap may allow flue gas to escape into the
room air.

▶ Fill the condensate trap with water before

starting up the product.

2

1

1. Remove the lower section of the condensate trap(2) by
unscrewing it from the condensate trap (1).

2. Fill the lower section of the condensate trap with water
up to about 10 mm below the upper edge.

3. Secure the lower section of the condensate trap cor­rectly to the condensate trap again.

7.14 Checking and adjusting the gas ratio

setting

7.14.1 Checking the factory setting

Caution.
An incorrect gas group setting may cause

operating faults or a reduction in the
working life of the product.

If the product design does not match the local
gas group, malfunctions will occur or you will
have to replace product components prema­turely.

▶ Before you start up the product, compare

the gas group information on the identific­ation plate with the gas group available at
the installation site.

The product's combustion has been factory tested and is
preset for operation with the gas group indicated on the iden­tification plate.

Conditions: The product design is not compatible with the local gas
group

If you want to operate the product with liquid gas, do not start
up the product.

A gas conversion must only be carried out by Vaillant Cus­tomer Service or the manufacturer of the product.

▶ Notify Vaillant Customer Service or the manufacturer of

the product that you want a gas conversion carried out.

7 Start-up

22 Installation and maintenance instructions ecoTEC plus 0020134823_04

Conditions: The product design is compatible with the local gas group

▶ Proceed as described below.

7.14.2 Checking the leak-tightness of the flue gas
system and for flue gas recirculation

1. Check that the flue gas system is intact, in accordance

with British Gas TB 200.

2. If the flue gas system is longer than 2 m, we urgently

recommend that you test the system for flue gas recir­culation as described below.

1

3. Use the air analysis point (1) to check for flue gas recir-

culation.

4. Use the flue gas measuring instrument.

5. If you discover CO or CO2 in the fresh air, search for a

leak in the flue gas system or for the flue gas recircula­tion.

6. Eliminate the damage.

7. Repeat the above-mentioned test to determine if the

fresh air contains CO or CO2.

8. If you cannot eliminate the damage, you must not start

up the boiler.

7.14.3 Checking the gas flow rate

The boiler is fitted with a multifunctional automatic gas valve
which ensures that the precise air/gas ratio is provided un­der all operating conditions. The gas flow rate has been set
during production and does not require adjustment. With the
front casing fitted check the gas flow rate of the boiler as fol­lows:

▶ Start up the product with the check programme P.01.
▶ In addition, ensure that maximum heat can be dissipated

into the heating system by turning up the room thermo­stat.

▶ Wait at least 5 minutes until the boiler has reached its

operating temperature.

▶ Ensure that all other gas appliances in the property are

turned off.

▶ Measure the gas flow rate at the gas meter.
▶ Compare the measured values with the corresponding

values in the table.

Nominal value for the
net heat supply in kW
in accordance with
BS EN 483

H gas in m³/h

Nominal +5% −10%

76.2 8.10 8.51 7.29

95.2 10.10 10.61 9.09

114.3 12.10 12.71 10.89

Conditions: Gas flow rate not in the permissible range

▶ Check all of the piping and ensure that the gas flow rates

are correct.

▶ Only put the product into operation once the gas flow

rates have been corrected.

Conditions: Gas flow rate in the permissible range

▶ End the check programme P.01.
▶ Allow the boiler to cool down by allowing pump overrun to

operate for a minimum of two minutes.

▶ Record the boiler maximum gas flow rate onto the

Benchmark gas boiler commissioning checklist.

7.14.4 Checking the gas flow pressure

1

1

806/5-5

1206/5-5

1006/5-5

1. Ensure that the gas inlet working pressure can be
obtained with all other gas appliances in the property
working.

2. Close the gas isolator cock.

3. Use a screwdriver to undo the sealing screw of the
measuring nipple (1) at the gas valve.

4. Connect a pressure gauge to the measuring nipple (1).

5. Open the gas isolator cock.

6. Start up the product with the check programme P.01.

7. In addition, ensure that maximum heat can be dissip­ated into the heating system by turning up the room
thermostat.

8. With the boiler operating at full load check that the gas
inlet working pressure at the reference test point (1)
complies with the requirements.

Start-up 7

0020134823_04 ecoTEC plus Installation and maintenance instructions 23

– Permissible gas flow pressure for operation with

G20 natural gas: 1.6 … 2.3 kPa (16.0 … 23.0 mbar)

9. Should the pressure recorded at the reference test point
in the boiler be lower than indicated check if there is
any blockage in the pipework or if the pipework is un­dersized.

Conditions: Gas flow pressure not in the permissible range

Caution.
Risk of material damage and operating

faults caused by incorrect gas flow pres­sure.

If the gas flow pressure lies outside the per­missible range, this can cause operating
faults in and damage to the product.

▶ Do not make any adjustments to the

product.

▶ Check the gas installation.
▶ Do not start up the product.

▶ If you cannot correct the failure, notify the gas supply

company and proceed as follows:

▶ End the check programme P.01.
▶ Allow the boiler to cool down by allowing pump overrun

to operate for a minimum of two minutes.

▶ Close the gas isolator cock.
▶ Remove the pressure gauge and retighten the sealing

screw (1) for the measuring nipple.

▶ Open the gas isolator cock.
▶ Check the measuring nipple for gas tightness.
▶ Close the gas isolator cock.
▶ Install the front casing. (→ Page 10)
▶ Disconnect the product from the power mains.
▶ You must not start up the boiler.

Conditions: Gas flow pressure in the permissible range

▶ End the check programme P.01.
▶ Allow the boiler to cool down allowing pump overrun to

operate for a minimum of two minutes.

▶ Close the gas isolator cock.
▶ Remove the pressure gauge and retighten the sealing

screw (1) for the measuring nipple.

▶ Open the gas isolator cock.
▶ Check the measuring nipple for gas tightness.
▶ Install the front casing. (→ Page 10)
▶ Reset boiler controls for normal operation.
▶ Record the appliance gas inlet working pressure (kPa

resp. mbar) in the Benchmark gas boiler commissioning
checklist.

7.14.5 Checking the CO₂ content and, if

necessary, adjusting it (air index setting)

1. Start up the product with the check programme P.01.

2. Wait at least five minutes until the product reaches its
operating temperature.

1

3. Measure the CO₂ and CO/CO₂ content at the flue gas

analysis point (1).

4. Compare the measured values with the corresponding
values in the table.

Settings Unit G 20

natural

gas

CO₂ after 5 minutes
in full load mode
with front casing
closed

Vol.–% 9.0 ±1.0

CO₂ after 5 minutes
in full load mode
with front casing
removed

Vol.–% 8.8 ±1.0

Set for Wobbe index
W

s

kWh/m³ 15.0

O₂ after 5 minutes
in full load mode
with front casing
closed

Vol.–% 4.89 ±1.80

CO content ppm ≤ 250

CO/CO2content

0.0028

7 Start-up

24 Installation and maintenance instructions ecoTEC plus 0020134823_04

Conditions: The CO₂ content must be adjusted

1

1

806/5-5

1006/5-5

1206/5-5

Caution.
Risk of poisoning due to an incorrectly

installed gas valve.

If the gas flow pressure is outside the per­missible ranges in the table, this may lead to
personal injury and material damage.

▶ Check the integrity of all gas lines.
▶ Check the flue gas guiding for leaks.
▶ Check the gas flow pressure.
▶ Check the connection value.

▶ Break through the sealing sticker.
▶ Set the CO₂ content (value with front casing removed)

by turning the screw (1).

Note

Turn to the left: Higher CO₂ content
Turn to the right: Lower CO₂ content

▶ Only carry out the adjustment in increments of 1/8 turn

and wait approximately 1 minute after each adjustment
until the value stabilises.

Note

On the VU GB 1006/5-5 and the VU GB
1206/5-5, after changing the direction of
rotation, the CO₂ content only changes
after approx. 1 turn of the adjusting screw
(overcoming the adjustment hysteresis).

The adjusting screw must protrude only
slightly from the casing.

▶ Select (Cancel) once the adjustments have been made.
▶ If an adjustment is not possible in the specified adjust-

ment range, you must not start up the product.

▶ If this is the case, inform Vaillant Customer Service.
▶ Install the front casing. (→ Page 10)

7.15 Checking leak-tightness

▶ Check the gas line, the heating circuit and the hot water

circuit for leak-tightness.

▶ Check the flue gas pipe for correct installation.

7.15.1 Checking the heating mode

1. Make sure that there is a heat requirement.

2. Call up the Live Monitor.

– Menu → Live Monitor

◁ If the product is working correctly, the display shows

S.04.

7.15.2 Checking the hot water generation

Conditions: Cylinder connected

▶ Make sure that the cylinder thermostat is requesting

heat.

1. Call up the Live Monitor.

– Menu → Live Monitor

◁ If the cylinder is charged correctly, the display

shows S.24.

2. If you have connected a controller which can be used to
set the hot water temperature, set the hot water temper­ature on the boiler to the maximum possible temperat­ure.

3. Adjust the target temperature for the connected do­mestic hot water cylinder to the controller.

◁ The boiler adopts the set target temperature which

is set on the controller (automatic calibration in
newer controllers).

7.16 Thoroughly flushing the heating installation

("hot")

1. Operate the appliance until the boiler and the heating
system are up to temperature.

2. Check the heating system for leaks.

3. Connect a hose to the drain valve located at the lowest
position of the heating system.

4. Shut off the boiler, open the drain valve and all purge
valves on the radiators and allow the water to flow out
of the heating system and the boiler quickly and fully.

5. Close the drain valve.

Adapting the unit to the heating installation 8

0020134823_04 ecoTEC plus Installation and maintenance instructions 25

6. Fill the heating system again with water as de­scribed in "Filling and purging the heating installation"
(→ Page 20).

7. Re-fill the system until the system design pressure of
0,1 MPa (1,0 bar) is attained.

Note

The actual reading on the digital pressure
gauge should ideally be 0,05 MPa (0,5 bar)
plus an additional pressure corresponding
to the highest point of the system above the
base of the boiler – 10 m head equals an ad­ditional 1 bar reading on the pressure gauge.
The minimum pressure should not be less
than 0,1 MPa (1 bar) in any installation. If
the system is to be treated with an inhibitor it
should be applied at this stage in accordance
with the manufacturer’s instructions. Further
information can be obtained from Sentinel,
Betz Dearborn Ltd., Tel: [phone], or
Fernox, Alpha– Fry technologies. Tel: 0870

8700362.

8. Install the side section. (→ Page 11)

9. Install the front casing. (→ Page 10)

8 Adapting the unit to the heating

installation

To reset the most important system parameters, use the

Appliance config. menu point.

Menu → Installer level Appliance config.

Or manually relaunch the installation assistant.

Menu → Installer level → Start inst. assistant

8.1 Calling up diagnostics codes

The settings options for more complex systems can be found
in the Diagnostics menu.

Menu → Installer level Diagnostics menu

Overview of diagnostics codes (→ Page 38)

Using the parameters that are marked as adjustable in the
overview of diagnostics codes, you can adapt the product to
the heating installation and the needs of the customer.

▶

Press or to change the diagnostics code.

▶

Press (Select) to select the parameter to change.

▶

Press or to change the current setting.

▶ Press (OK) to confirm your selection.

8.2 Setting the heating partial load

The heating partial load of the product is set to Auto at the
factory. If you still want to set a fixed maximum heating par­tial load, you can set a value under D.000, which equates to
the product output in kW.

If the product is operated in cascade, you must raise the
fan speed of the unit partial load to 1500 rpm (D.050) when
operating it with Natural gas and you must never raise the
speed under D.050 any higher when operating it with Liquid
gas because a higher speed is already being used.

If a domestic hot water cylinder (cylinder type VIH) is in­stalled, you can adjust the partial load setting for the cylinder
charging to the cylinder type (D.077).

8.3 Setting the pump overrun and pump
operating mode

You can set the pump overrun under D.001 (default setting:
5 min.).

You can set the pump operating modes Eco or Comfort
under D.018.

In Comfort mode, the internal pump is switched on when the
heating flow temperature is not at Heating off ( Operating
instructions) and the heating requirement is enabled via an
external controller.

Eco (default setting) is useful for removing residual heat
after hot water generation when the heat demand is ex­tremely low and large target temperature spreads exist
between the hot water generation and heating mode target
values. This prevents living rooms from being under­supplied. If there is a heat demand, the pump is switched
on every 25 minutes for 5 minutes once the overrun time
has elapsed. When operating in cascade with a low loss
header or system separation, Vaillant recommends the Eco
operating mode.

If a system separation is installed, you must set the pump to
continuous mode (85%) (set diagnostics code D.014 to 4).

8.4 Setting the maximum flow temperature

You can set the maximum flow temperature for the heating
mode under D.071 (default setting: 75 °C).

8.5 Setting the return flow temperature control

If the product is connected to an underfloor heating system,
the temperature control can be changed from flow temperat­ure control (default setting) to return flow temperature control
under D.017. If you have activated the return flow temper­ature control under D.017, the automatic heating output de­termination function is not active. If you set D.000 to Auto
anyway, the product operates with the maximum possible
heating partial load.

9 Inspection and maintenance

26 Installation and maintenance instructions ecoTEC plus 0020134823_04

8.6 Burner anti-cycling time

8.6.1 Setting the burner anti-cycling time

To prevent frequent switching on and off of the burner and
thus prevent energy losses, an electronic restart lockout
is activated for a specific period each time the burner is
switched off. You can adjust the burner anti-cycling time to
the conditions of the heating installation. The burner anti­cycling time is only active for the heating mode. You can set
the maximum burner anti-cycling time under D.002 (default
setting: 20 min.). The effective burner anti-cycling times with
respect to the target flow temperature and the maximum set
burner anti-cycling time can be found in the following table:

T

Flow

(target)
[°C]

Set maximum burner anti-cycling time [min]

1 5 10 15 20 25 30

30 2.0 4.0 8.5 12.5 16.5 20.5 25.0

35 2.0 4.0 7.5 11.0 15.0 18.5 22.0

40 2.0 3.5 6.5 10.0 13.0 16.5 19.5

45 2.0 3.0 6.0 8.5 11.5 14.0 17.0

50 2.0 3.0 5.0 7.5 9.5 12.0 14.0

55 2.0 2.5 4.5 6.0 8.0 10.0 11.5

60 2.0 2.0 3.5 5.0 6.0 7.5 9.0

65 2.0 1.5 2.5 3.5 4.5 5.5 6.5

70 2.0 1.5 2.0 2.5 2.5 3.0 3.5

75 2.0 1.0 1.0 1.0 1.0 1.0 1.0

T

Flow

(target)
[°C]

Set maximum burner anti-cycling time [min]

35 40 45 50 55 60

30 29.0 33.0 37.0 41.0 45.0 49.5

35 25.5 29.5 33.0 36.5 40.5 44.0

40 22.5 26.0 29.0 32.0 35.5 38.5

45 19.5 22.5 25.0 27.5 30.5 33.0

50 16.5 18.5 21.0 23.5 25.5 28.0

55 13.5 15.0 17.0 19.0 20.5 22.5

60 10.5 11.5 13.0 14.5 15.5 17.0

65 7.0 8.0 9.0 10.0 11.0 11.5

70 4.0 4.5 5.0 5.5 6.0 6.5

75 1.0 1.0 1.0 1.0 1.0 1.0

Note

The remaining burner anti-cycling time following a
regular shutdown in heating mode can be called
up under D.067.

8.6.2 Resetting the remaining burner anti-cycling
time

1st option

Menu → Reset anti-cycl. time

The current burner anti-cycling time appears in the display.

▶ Confirm the burner anti-cycling time reset by pressing

(Select).

2nd option

▶ Press the fault clearance key.

8.7 Setting the maintenance interval

If you set the maintenance interval, the message that the
product must be serviced appears in the display, together
with the maintenance symbol , after a configurable number
of burner operating hours. The display on the eBUS control­ler shows the information Maintenance MAIN.

▶ Set the operating hours until the next maintenance work

is due using D.084. You can set the operating hours in
increments of ten from 0 to 3010 h (hours).

If you do not set a numerical value, but instead set the sym­bol "–", the "Maintenance display" function is not active.

Note

On completion of the set operating hours, you
must set the maintenance interval again.

8.8 Setting the pump output

The product can be equipped with a pump group with a mod­ulating or high-efficiency pump (accessories). Both pumps
are fully modulating and are actuated depending on the heat
requirement.

The remaining feed head of this pump group is designed so
that the full heat output is transported as far as the system
separation.

You can find the remaining feed head of the pumps in the
section "Hydraulic connection" (→ Page 13).

8.9 Handing the product over to the operator

1. When you have finished the installation, attach the
sticker supplied (835593) to the front of the product in
the operator's language.

2. Explain to the operator how the safety devices work and
where they are located.

3. Inform the operator how to handle the product. Answer
any questions the operator may have. In particular,
draw attention to the safety information which the op­erator must follow.

4. Inform the operator of the necessity to have the product
maintained according to the specified intervals.

5. Pass all of the instructions and documentation for the
product to the operator for safe-keeping.

6. Inform the operator about measures taken to ensure the
supply of combustion air and flue gas guiding, and in­struct the operator that he must not make any changes.

9 Inspection and maintenance

Auxiliary service equipment:

You require the following tool for the inspection and mainten­ance:

– SW8 socket with extension
– Torx screwdriver 20, 25 and 30
– 5 mm hexagon socket

▶ Carry out all inspection and maintenance work in the

order shown in the table "Overview of inspection and
maintenance work".

Inspection and maintenance 9

0020134823_04 ecoTEC plus Installation and maintenance instructions 27

9.1 Observing inspection and maintenance
intervals

Warning.
Risk of injury and a risk of material dam-

age caused by negligent inspection and
maintenance work.

Negligence in inspection and maintenance
work, as well as failure to comply with the
specified inspection and maintenance in­tervals, may impair the operational safety of
the product and lead to injuries and material
damage.

▶ Instruct the operator that the prescribed

inspection and maintenance intervals
must be complied with as a minimum re­quirement.

▶ Carry out a regular inspection once a

year.

▶ Carry out regular maintenance work in line

with the findings from the inspection. The
maintenance interval must not be longer
than two years.

Warning.
Risk of injury and death due to improper

inspection and maintenance!

Improper performance of inspections and
maintenance work may result in leaks or
even an explosion.

▶ Inspection and maintenance work on the

product must only be carried out by pro­fessionally qualified persons.

Any customer service work must be carried out by a profes­sionally qualified person in accordance with the safety, in­stallation and operating provisions for gas-fired units. Pro­fessional qualification must be confirmed by an adequately
recognised organisation or public office.

Note

The person who carries out a combustion meas­urement must be trained in the use of a flue gas
measuring instrument and in interpreting the res­ults. The flue gas measuring instrument that is
used must be calibrated in accordance with the
specifications of the measuring instrument manu­facturer. The correct fuel type must be set on the
flue gas measuring instrument.

Inspection

The inspection is intended to determine the actual condition
of the product and compare it with the target condition. This
is done by measuring, checking and observing.

Maintenance

Maintenance is required in order to eliminate any deviations
of the actual condition from the target condition. This is nor-

mally done by cleaning, setting and, if necessary, replacing
individual components that are subject to wear.

As the competent person, you determine the maintenance
intervals (at least once every two years) and their scope
based on the how you define the condition of the product
during the inspection. Carry out all inspection and mainten­ance work in the sequence shown in Appendix C.

9.2 Procuring spare parts

The original components of the product were also certified
by the manufacturer as part of the declaration of conformity.
If you use other, non-certified or unauthorised parts during
maintenance or repair work, this may void the conformity of
the product and it will therefore no longer comply with the
applicable standards.

We strongly recommend that you use original spare parts
from the manufacturer as this guarantees fault-free and safe
operation of the product. To receive information about the
available original spare parts, contact the contact address
provided on the reverse of these instructions.

▶ If you require spare parts for maintenance or repair

work, use only the spare parts that are permitted for the
product.

9.3 Using the function menu

The function menu allows you to actuate and test individual
components in the heating installation.

Menu → Installer level → Test programs → Function menu

▶ Choose the heating installation components.
▶ Press (Select) to confirm your selection.

Display

Test
programme

Action

T.01 Check boiler

circulation pump

Switch the boiler circulation
pump on and off.

T.03 Check fan Switch the fan on and off.

The fan runs at maximum
rotational speed.

T.04 Check cylinder

charge pump

Switch the cylinder charging
pump on and off.

T.05 Check circulation

pump

Switch the circulation pump
on and off.

T.06 Check external

pump

Switch the external pump on
and off.

T.08 Check burner The product starts up and

switches to minimum load.
The flow temperature is
shown in the display.

Terminate function menu

▶ To terminate the function menu, select (Cancel).

9 Inspection and maintenance

28 Installation and maintenance instructions ecoTEC plus 0020134823_04

9.4 Carrying out electronics self-tests

Menu → Installer level → Test programs → Electronics
self-test

You can use the electronics self-test to check the PCB in
advance.

9.5 Removing the gas-air mixture unit

Note

The gas-air mixture unit consists of four main
components:

– Speed-regulated fan,

– Air intake pipe,

– Gas valve,

– Burner

1. Switch off the product using the on/off button.

2. Disconnect the product from the power mains.

3. Close the gas isolator cock.

4. Remove the front casing. (→ Page 10)

5. Remove the upper casing. (→ Page 10)

Conditions: Applies for 80 kW

2

1

▶ Undo the clip (1) on the air intake pipe (2). and remove

the air intake pipe from the intake nozzle.

3

4

▶ Undo the four screws on the flange connection (3) to the

gas valve.

Conditions: Applies for 100 kW and 120 kW

3

4

▶ Undo the four screws on the flange connection (3) to the

gas valve.

6. Move the gas pipe (4) to the side.

Inspection and maintenance 9

0020134823_04 ecoTEC plus Installation and maintenance instructions 29

8

9

10

11

13

5

6

7

12

11

8

10

12

5

6

7

9

13

806/5-5

1006/5-5
1206/5-5

Danger!
Risk of poisoning and fire caused by es-

caping gas!

The gas pipe may become damaged.

▶ Ensure that you do not damage the seals

on the gas pipe when removing and in­stalling the gas-air mixture unit.

7. Remove the ionisation line plug from the ionisation elec-

trode (11), and remove the ground connection plug from
the earthing lug.

8. Remove the ignition line plug and the ground connec-

tion for the ignition electrode (9) from the ignition trans­former.

Note

The cable is firmly connected to the ignition
electrode.

9. Remove the plugs (12) and (13) from the fan motor by
pushing in the latching lug.

10. Remove the plug from the gas valve (10).

11. Remove the plug from the upper safety cut-out (8).

12. Undo the screws (6) on the burner door.

13. Remove the complete gas-air mixture unit (5) from the

heat exchanger (7).

14. Check the burner and the heat exchanger for damage

and dirt.

9.6 Cleaning the heat exchanger

1. Protect the electronics box against sprayed water.

1

2. Remove the lower section of the condensate trap to
ensure that any existing condensate neutraliser does
not become damaged.

3. Rinse away any loose dirt in the heat exchanger (1)
with a sharp jet of water or use a plastic brush.

◁ The water flows out of the heat exchanger through

the drain.

4. Install the condensate trap.

9 Inspection and maintenance

30 Installation and maintenance instructions ecoTEC plus 0020134823_04

9.7 Checking the burner

1

2

5

3

4

1. Check the surface of the burner for damage. If you no­tice any damage, replace the burner and seal, see "Re­placing the burner (→ Page 33)").

2. Check the insulating mat (2) on the burner door. If you
notice any signs of damage, replace the insulating mat,
see "Replacing the burner (→ Page 33)".

9.8 Replacing the ignition and ionisation

electrodes

1

Caution.
Risk of material damage caused by dam-

age to the ignition and ionisation elec­trodes.

The electrodes may become damaged during
installation.

▶ Install the new electrodes only after first

installing the gas-air mixture unit.

1. Remove the electrodes (1) from the burner door from
above.

2. Insert the new electrodes with new seals.
– Torque: 2.8 Nm

9.9 Cleaning the condensate trap

2

1

1. Remove the lower section of the condensate trap(2) by
unscrewing it from the condensate trap (1).

2. Flush out the lower section of the condensate trap with
water.

3. Fill the lower section of the condensate trap with water
up to about 10 mm below the upper edge.

4. Secure the lower section of the condensate trap to the
condensate trap again.

9.10 Installing the gas-air mixture unit

1. Replace the seal in the burner door.

2. Ensure that the bracket for the insulating mat is
installed properly again after it is replaced.

3. Replace all seals at the sealing points opened during
the maintenance work.

Troubleshooting 10

0020134823_04 ecoTEC plus Installation and maintenance instructions 31

8

9

10

11

13

5

6

7

12

11

8

10

12

5

6

7

9

13

806/5-5

1006/5-5
1206/5-5

4

4

4. Connect the gas-air mixture unit (5) to the heat ex­changer (7).

5. Tighten the screws (6) in a cross-wise pattern until the
burner door fits closely and uniformly onto the mating
surfaces.

– Torque: 10 Nm

6. Connect the ignition line plug and the ground connec­tion for the ignition electrodes (9) to the ignition trans­former.

7. Connect the ionisation line plug to the ionisation elec­trode (11) and connect the ground connection plug to
the earthing lug.

8. Connect the safety cut-out plug to the upper safety cut­out (8).

9. Connect the plugs (12) and (13) to the fan motor.

10. Connect the plug (10) to the gas valve.

11. Connect the gas pipe (4) with a new seal to the gas

valve.

Conditions: Applies for 80 kW

– Torque: 2 Nm

Conditions: Applies for 100 kW and 120 kW

– Torque: 2.8 Nm

Warning.
Risk of poisoning and fire caused by es-

caping gas!

Gas can escape through leaks.

▶ Check the gas tightness at the gas con-

nection using leak detection spray.

12. Open the gas isolator cock on the product.

Conditions: Applies for 80 kW

2

1

▶ Check that the sealing ring in the air intake pipe (2) is

positioned correctly in the seal seat.

▶ Reconnect the air intake pipe to the intake nozzle.
▶ Secure the air intake pipe with the clip (1) on the intake

nozzle.

13. Close the electronics box.

14. Install the front casing. (→ Page 10)

15. Re-establish the connection to the power mains.

9.11 Draining the product

1. Switch off the product using the on/off button.

2. Close the service valves of the product.

3. Start the check programme P.06.

4. Open the drain valves.

9.12 Completing inspection and maintenance
work

Once you have completed all maintenance work:

▶ Check the gas flow pressure. (→ Page 22)
▶ Check the CO₂ content and, if necessary, adjust it (air

index setting). (→ Page 23)

10 Troubleshooting

You can find an overview of the fault codes in the appendix.

Overview of fault codes (→ Page 42)

10 Troubleshooting

32 Installation and maintenance instructions ecoTEC plus 0020134823_04

10.1 Contacting your service partner

If you contact your Vaillant service partner, if possible,
please mention

– the fault code that is displayed (F.xx),
– the product status (S.xx) that is displayed on the Live

Monitor (→ Page 17).

10.2 Calling up service messages

If the maintenance symbol appears in the display, there is
a service message.

The maintenance symbol appears if you have set a mainten­ance interval, for example, and it has elapsed. The product is
not in fault mode.

▶ To obtain more information about the service message,

call up the Live monitor (→ Page 17).

Conditions: S.44-S.48 is displayed

The product is in Comfort protection mode. The product con­tinues to run with restricted comfort after it has detected a
fault.

▶ To establish whether or not a component is defective,

read the fault memory (→ Page 32).

Note

If no fault message is present, the product will
automatically switch back to normal operating
mode after a certain time.

10.3 Reading off the fault codes

If a fault develops in the product, the display shows a fault
code F.xx.

Fault codes have priority over all other displays.

If multiple faults occur at the same time, the display shows
the corresponding fault codes for two seconds each in se­quence.

▶ Rectify the fault.
▶ To restart the product, press the fault clearance key (

Operating instructions).

▶ If you are unable to remedy the fault and the fault recurs

despite several fault clearance attempts, contact Vaillant
Service.

10.4 Querying the fault memory

Menu → Installer level Fault list

The product has a fault memory. You can use this to query
the last ten faults that occurred in chronological order.

The display shows:

– The number of faults that have occurred
– The fault currently selected with fault number F.xx
– A plain text display explaining the fault.

▶ You can display the last ten faults that have occurred by

pressing or .

Overview of fault codes (→ Page 42)

10.5 Resetting the fault memory

▶

To delete the entire fault list, press (Delete, OK)
twice.

10.6 Performing diagnostics

▶ You can use the function menu (→ Page 27) to actuate

and test individual components of the product in the fault
diagnostics.

10.7 Using check programmes

You can also use check programmes (→ Page 19) for
troubleshooting.

10.8 Resetting parameters to factory settings

▶ To reset all parameters simultaneously to the default

settings, set D.096 to 1.

10.9 Preparing the repair work

1. Decommission the product.

2. Disconnect the product from the power mains.

3. Remove the front casing.

4. Close the gas isolator cock.

5. Close the service valves in the heating flow and in the
heating return.

6. Close the service valve in the cold water pipe.

7. Drain the product if you want to replace water-bearing
components of the product.

8. Make sure that water does not drip on live components
(e.g. the electronics box).

9. Use only new seals.

Troubleshooting 10

0020134823_04 ecoTEC plus Installation and maintenance instructions 33

10.10 Replacing defective components

10.10.1 Replacing the gas valve

2

2

806/5-5

1006/5-5
1206/5-5

1

1

1. Remove the gas pipe (1) from the gas valve.

2. Unscrew the screws (2) from the fan and remove the
gas valve from the fan.

3. Replace the defective component.

4. Install the gas valve and the fan in the same position as
before. Use new seals for this.

5. Tighten the screws (2) in a cross-wise pattern.

Conditions: Applies for 80 kW

– Torque: 5.5 Nm

Conditions: Applies for 100 kW and 120 kW

– Torque: 2 Nm

6. First, screw the gas pipe loosely onto the gas valve.
Only after completing the installation work should you
tighten the screws for the flange fastening on the gas
valve.

7. After installing the new gas valve, carry out a leak-

tightness test (→ Page 24), and set the gas ratio
(→ Page 21).

10.10.2 Replacing the burner

1

2

5

3

4

1. Remove the gas-air mixture unit. (→ Page 28)

2. Remove the ignition and monitoring electrode.

3. Remove the seal (5) from the burner door.

4. Turn the insulation protection plate (1) to remove it.

5. Remove the insulating mat (2).

6. Undo the nuts (3) on the burner.

7. Use a suitable socket (with extension) to ensure that
the burner mat does not become damaged. You must
not use burners that have a damaged mat.

8. Remove the burner. When doing so, hold the fan and
the burner door securely.

9. Fit the new burner with a new seal.

10. When installing the retainer, ensure that you position it

in the locations at which the insulation protection plate
has suitable cut-outs.

11. Use the three nuts and the washers (4) to secure the

burner and the retainer for the insulation protection
plate.

Conditions: Applies for 80 kW

– Torque: 4 Nm

12. First, use two nuts to secure the burner.

Conditions: Applies for 100 kW and 120 kW

– Torque: 4 Nm

13. Then use the four remaining nuts to secure the burner

and the retainer for the insulation protection plate.

Conditions: Applies for 100 kW and 120 kW

– Torque: 4 Nm

14. Install the insulating mat. Note that the insulating mat is

touching the burner door and the cut-outs for the insu­lating mat lie above the cut-outs for the burner door.

15. Install the insulation protection plate by turning the bay-

onet fitting until it clicks into place.

10 Troubleshooting

34 Installation and maintenance instructions ecoTEC plus 0020134823_04

16. Install the ignition and monitoring electrodes. Use new
seals for this.

– Torque: 2.8 Nm

17. Install the gas-air mixture unit. (→ Page 30)

18. Check that the product functions correctly and check
the leak-tightness (→ Page 24).

10.10.3 Replacing the insulating mat

If the safety cut-out on the burner door has been triggered,
the insulating mat between the burner door and burner room
may be damaged.

▶ Check and replace the insulating mat.

Note

To replace the insulating mat, proceed in the
same way as when removing the burner. It is
not necessary to remove the burner.

10.10.4 Replacing the fan

1. Remove the gas-air mixture unit. (→ Page 28)

1

2. Undo the four nuts (1) on the fan.

3. Install the new fan on the burner door in the same ori-

entation in which it was previously positioned.

Conditions: Applies for 80 kW and 100 kW

– Torque: 3.5 Nm

Conditions: Applies for 120 kW

– Torque: 6 Nm

Note

Tighten the screws on the fan evenly. The
fan must not be at an angle.

10.10.5 Replacing the heat exchanger

1. Drain the product. (→ Page 31)

2. Remove the gas-air mixture unit. (→ Page 28)

3. Unscrew the flow and return line in the front area of the

underside of the product.

4. Release the sealing collars on the flow and return pipe
from the floor plate.

1

5. Remove the screws (1) from the heat exchanger
bracket.

6. Lift the heat exchanger out of its bracket (this requires
two people). The pipes can be used as handles for this.

7. Install the new heat exchanger in reverse order.

8. Install the gas-air mixture unit. (→ Page 30)

9. Fill and purge the product and, if necessary, the heating
installation.

10.10.6 Replacing the PCB and/or the display

Caution.
Risk of material damage caused by incor-

rect repairs.

Using an incorrect replacement display may
cause damage to the electronics.

▶ Before replacing, check that the correct

replacement display is available.

▶ Never use another replacement display.

Note

If you are replacing only one component, the set
parameters are transferred automatically. When
the product is switched on, the new component
adopts the previously set parameters from the
unreplaced component.

Decommissioning 11

0020134823_04 ecoTEC plus Installation and maintenance instructions 35

1. Disconnect the unit from the power mains and secure it
against being switched back on again.

Conditions: Replacing the display or PCB

▶ Replace the PCB or display according to the assembly

and installation instructions supplied.

Conditions: Replacing the PCB and display at the same time

▶ Select the required language.

◁ If you are replacing both components at the same

time, the product switches directly to the menu to
select the language after switching on. The default
language setting is English.

▶ Confirm your setting by pressing (OK).

◁ You are automatically taken to D.093 to set the

device specific number.

▶ Select the correct value for the relevant product type in

accordance with the following table.

Device Specific Numbers (DSN - Device Spe­cific Number) for the product types

Product type number

806 (VU GB 806/5‑5)

82

1006 (VU GB 1006/5‑5)

81

1206 (VU GB 1206/5‑5)

80

▶ Confirm your setting.

◁ The electronics are now set to the product type and

the parameters of all diagnostics codes are set to
default settings.

◁ The display automatically restarts with the installation

assistant.

▶ Make the system-specific settings.

10.11 Completing repair work

▶ Check that the product functions correctly and check the

leak-tightness (→ Page 24).

11 Decommissioning

11.1 Decommissioning the product

▶ Switch off the product.
▶ Disconnect the product from the power mains.
▶ Close the gas isolator cock.
▶ Close the cold water stop valve.
▶ Drain the product. (→ Page 31)

12 Recycling and disposal

Disposing of the packaging

▶ Dispose of the packaging correctly.
▶ Observe all relevant regulations.

13 Customer service

To ensure efficient and reliable operation of your boiler it is
recommended that regular servicing is carried out by your
service provider.

Appendix

36 Installation and maintenance instructions ecoTEC plus 0020134823_04

Appendix

A Installer level menu structure – Overview

Menu

Installer level

Reset burner off time

Information

Back Select

Appliance config.

Test programs

Installer level

Fault list

Back Select

Test programs

Gas type check

Function menu

Check programs

Back Select

Function menu

Test programs
Gas type check

Check programs

Back Select

Function menu

Check programs

Test programs

Self test electronics

Back Select

Appliance config.

Test programs

Diagnosis menu

Installer level

Back Select

Target flow temp.

Appliance config.

Language

DHW temperature

Back Select

Target flow temp.

Appliance config.
Language

DHW temperature

Back Select

Target flow temp.

Appliance config.
Language

DHW temperature

Back Select

Appliance config.

Test programs

Installer level
Fault list

Back Select

Enter code

1 7

Back OK

F.7 5

Fault

Pump water shortage

F. 0 0
Interruption
Flow sensor

P. 0 0

Pump is

actuated

Purging

cyclically

Back

Select

Gas type check

Type of gas

Select

LPG

Back

Select

Self test

Self diagnosis

of the electronics

Back

Select

Language

01 Deutsch

Cancel OK

P.00 Purging

Pump is cyclically

Select

actuated

Back

Select

41

Target flow temp.

Cancel OK

35

DHW temperature

Cancel OK

Function menu

Test programs

Self test electronics

Check programs

Back Select

T.0 1

internal pump

Back Select

T.0 1

internal pump

Back

Select

Note
The menu entry Menu → Installer level → Test programs → Gas family check is not working.

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 37

Target flow temp.

Appliance config.

DHW temperature

Comfort mode

Back Select

Comfort mode

Comfort on

Cancel OK

Appliance config.

Test programs

Diagnosis menu

Installer level

Back Select

Appliance config.

Start inst. assistant

Diagnosis menu

Installer level

Back Select

Auxiliary relay

Appliance config.
DHW temperature
Comfort mode

Back Select

Auxiliary relay

Appliance config.

Accessory relay 1

Comfort mode

Back Select

Auxiliary relay

Appliance config.

Accessory relay 2

Accessory relay 1

Back Select

Heating partial load

Appliance config.

Accessory relay 2

Accessory relay 1

Back Select

Heating partial load

Appliance config.
Accessory relay 2

Contact data

Back Select

Heating partial load

Appliance config.

Factory setting

Contact data

Back Select

D.026

Auxiliary relay

External pump

Cancel OK

D.026

Auxiliary relay

Circulation pump

Back

D.027

Accessory relay 1

External pump

Cancel OK

D.027

Accessory relay 1

Circulation pump

Back

D.028

Accessory relay 2

External pump

Cancel OK

D.028

Accessory relay 2

Circulation pump

Back

D.000

Heating partial load

0

Cancel OK

D.001

Pump overrun

Heating

0

Back

D.000

Heating partial load

auto

Back

Contact data

Phone number

Back

To start the In-

stallation assist.

press OK

Cancel OK

D.096

Reset to

factory settings?

No

Cancel OK

Appendix

38 Installation and maintenance instructions ecoTEC plus 0020134823_04

B Overview of diagnostics codes

Code Parameter Values or explanations

Default
setting

Own setting

D.000 Heating partial load Adjustable heating partial load in kW

Auto: Product automatically adjusts max. partial load to
current system demand

Auto

D.001 Overrun time of internal heating

pump for heating mode

2 … 60 min 5 min

D.002 Max. burner anti-cycling time heating

at 20 °C flow temperature

2 … 60 min 20 min

D.005 Flow temperature target value (or

return target value)

In °C, max. of the value set in D.071, limited by an eBUS
controller if connected

Not ad­justable

D.006 Hot water temperature target value 35 … 65 ℃ Not ad-

justable

D.007 Warm start temperature target value 40 … 65 ℃

Frost protection is at 15 °C, then 40 to 70 °C (max.
temperature can be adjusted under D.020)

Not ad­justable

D.010 Heating pump status of the pump

group

0 = Off

1 = On

Not ad­justable

D.011 Status of external heating pump 0 = Off

1-100 = On

Not ad­justable

D.014 Pump speed target value (high-

efficiency pump)

Heating circuit pump target value in %

0 = Auto

1 = 53

2 = 60

3 = 70

4 = 85

5 = 100

Auto

D.016 24 V DC room thermostat

open/closed

0 = Room thermostat open (no heating mode)

1 = Room thermostat closed (heating mode)

Not ad­justable

D.017 Heating flow/return temperature

control changeover

Control type:

0 = Flow, 1 = Return

0 = Flow

D.018 Pump operating mode setting 1 = Comfort (continuously operating pump)

3 = Eco (intermittently operating pump)

3 = Eco

D.022 Hot water demand via C1/C2, in-

ternal hot water control system

0 = Off

1 = On

Not ad­justable

D.023 Summer/winter mode (heating off/on) 0 = Heating off (Summer mode)

1 = Heating on

Not ad­justable

D.025 Hot water generation enabled by

eBUS controller

0 = Off

1 = On

Not ad­justable

D.026 Auxiliary relay control 1 = Circulation pump

2 = External pump

3 = Cylinder charging pump

4 = Extractor hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Legionella protection pump (not active)

10 = Solar valve (not active)

2 = External
pump

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 39

Code Parameter Values or explanations

Default
setting

Own setting

D.027 Switching of relay 1 on the VR 40 "2

in 7" multi-functional module

1 = Circulation pump

2 = External pump

3 = Cylinder charging pump

4 = Extractor hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Legionella protection pump (not active)

10 = Solar valve (not active)

1 = Circula­tion pump

D.028 Switching of relay 2 on the VR 40 "2

in 7" multi-functional module

1 = Circulation pump

2 = External pump

3 = Cylinder charging pump

4 = Extractor hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Legionella protection pump (not active)

10 = Solar valve (not active)

2 = External
pump

D.033 Fan speed target value In rpm Not ad-

justable

D.034 Fan speed actual value In rpm Not ad-

justable

D.039 Solar feed temperature Actual value in °C Not ad-

justable

D.040 Flow temperature Actual value in °C Not ad-

justable

D.041 Return temperature Actual value in °C Not ad-

justable

D.044 Digitised ionisation value Display field 0 to 1020

> 800 no flame

< 400 good flame

Not ad­justable

D.046 Pump type 0 = Relay with disable facility

1 = PWM with disable facility

0 = Relay
with disable
facility

D.047 Outside temperature (with Vaillant

weather compensator)

Actual value in °C Not ad-

justable

D.050 Offset for minimum speed In rpm, setting range: 0 to 3000 Nominal

value set in
factory

D.051 Offset for maximum speed In rpm, setting range: -990 to 0 Nominal

value set in
factory

D.060 Number of temperature limiter shut-

downs

Number of shutdowns Not ad-

justable

D.061 Number of ignition device cutoffs Number of unsuccessful ignitions in the last attempt Not ad-

justable

D.064 Average ignition time In seconds Not ad-

justable

D.065 Maximum ignition time In seconds Not ad-

justable

D.067 Remaining burner anti-cycling time In minutes Not ad-

justable

D.068 Unsuccessful ignitions at 1st attempt Number of unsuccessful ignitions Not ad-

justable

D.069 Unsuccessful ignitions at 2nd at-

tempt

Number of unsuccessful ignitions Not ad-

justable

D.071 Target value maximum heating flow

temperature

40 … 85 ℃ 75 ℃

Appendix

40 Installation and maintenance instructions ecoTEC plus 0020134823_04

Code Parameter Values or explanations

Default
setting

Own setting

D.072 Internal pump overrun after cylinder

charging

Adjustable from 0 to 10 mins 2 min

D.076 Device specific number 82 = VU 806

81 = VU 1006

80 = VU 1206

Not ad­justable

D.077 Limit on cylinder charging output inkWAdjustable cylinder charging output in kW

D.080 Operating hours, heating In hours (h) Not ad-

justable

D.081 Operating hours, hot water genera-

tion

In hours (h) Not ad-

justable

D.082 Number of burner start-ups in heat-

ing mode

Number of burner start-ups Not ad-

justable

D.083 Number of burner start-ups in hot

water mode

Number of burner start-ups Not ad-

justable

D.084 Maintenance indicator: Number of

hours until the next maintenance

Adjustment range: 0 to 3000 hrs and "---" for deactivated „---”

D.090 Status of digital controller Recognised, not recognised Not ad-

justable

D.091 Status of DCF with external temper-

ature sensor connected

No reception

Reception

Synchronised

Valid

Not ad­justable

D.093 Unit variant setting (DSN) Setting range: 0 to 99

D.094 Delete fault history Delete fault list

0 = No

1 = Yes

D.095 Software version of the eBUS com-

ponents

1. PCB (BMU)

2. Display (AI)

4. HBI/VR34

Not ad­justable

D.096 Default setting Reset all adjustable parameters to factory setting

0 = No

1 = Yes

C Inspection and maintenance work – Overview

Note

The table below lists the manufacturer requirements with respect to minimum inspection and maintenance inter­vals. If national regulations and directives require shorter inspection and maintenance intervals, you should ob­serve these instead of the intervals listed in the table.

No. Work

Inspection

(annual)

Mainten-

ance

(at least

every

2 years)

1

Check the flue pipe for leak-tightness and correct fastening. Make sure that it is not blocked or
damaged and has been installed in accordance with the relevant Installation Manual.

X X

2

Check the general condition of the product. Remove dirt from the product and from the vacuum
chamber.

X X

3

Visually inspect the general condition of the entire heating cell and, in particular, check for signs
of corrosion, soot or other damage. If you notice any damage, carry out maintenance work.

X X

4

Check the gas connection pressure at maximum heat input. If the gas connection pressure is not
within the correct range, carry out maintenance work.

X X

5

Check the CO₂ content (the air ratio) of the product and, if necessary, adjust it. Keep a record of
this.

X X

6

Disconnect the product from the power mains. Check that the electrical plug connections and
other connections are seated correctly and correct these if necessary.

X X

7

Close the gas isolator cock and the service valves.

X

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 41

No. Work

Inspection

(annual)

Mainten-

ance

(at least

every

2 years)

8

Check, and if necessary correct, the charge pressure of the expansion vessel.

X

9

Remove the gas-air mixture unit (burner door with fan and gas valve).

X

10

Check all seals and the insulating mat in the combustion area. If you notice any damage, replace
the seals or insulating mat. Replace the burner door seal after each time it is opened and, ac­cordingly, each time maintenance work is carried out.

X

11

Clean the heat exchanger.

X

12

Check the burner for damage and replace it if necessary.

X

13

Check the condensate trap on the product, clean and fill if necessary.

X X

14

Reinstall the gas-air mixture unit. Caution: Replace the seals.

X

15

Replace the ignition and monitoring electrodes and the associated seals.

X

16

Motorised flue non-return flaps for cascade operation: Check that the flue non-return flap func­tions faultlessly. If required, clean the inside and outside of the casing, as well as the shut-off
disc and the shaft.

X

17

Open the gas isolator cock, reconnect the product to the power mains and switch the product on.

X X

18

Open the service valves, fill up the product/heating installation to 1.0-4.5 bar (depending on the
static height of the heating installation) and start the purging programme P.00.

X

19

Perform a test operation of the product and heating installation, including hot water generation,
and purge the system once more if necessary.

X X

20

Visually inspect the ignition and burner behaviour.

X X

21 Check the CO₂ content (the air ratio) of the product again.

X

22

Check the product for gas, flue gas, hot water and condensate leaks, and repair if necessary.

X X

23

Record the inspection/maintenance work carried out.

X X

24 Check the quality of the heating water (hardness level) and log the values in a system book. If

required, use water treatment to correct the water hardness.

X X

D Status codes – Overview

Status code Meaning

Heating mode

S.00 Heating: No heat demand

S.02 Heating mode: Pump pre-run

S.03 Heating mode: Ignition

S.04 Heating mode: Burner on

S.05 Heating mode: Pump/fan overrun

S.06 Heating mode: Fan overrun

S.07 Heating mode: Pump overrun

S.08 Heating mode: Remaining anti-cycling time

S.09 Heating mode: Measuring program

S.20 DHW demand

S.22 DHW mode: Pump pre-run

S.23 DHW mode: Ignition

S.24 DHW mode: Burner on

S.25 DHW mode: Pump/fan overrun

S.26 DHW mode: Fan overrun

S.27 Hot water handling: Pump overrun

S.28 DHW mode: Burner anti-cycling time

Special cases

S.30 Room thermostat (RT) is blocking heating mode

S.31 Summer mode active or no heat requirement from eBUS controller

Appendix

42 Installation and maintenance instructions ecoTEC plus 0020134823_04

Status code Meaning

S.32 Waiting period because of fan speed deviation

S.34 Frost protection mode active

S.36 Target value of the eBUS controller is < 20 °C and is blocking heating mode

S.37 Fan waiting period: Fan failure in operation

S.39 "Burner off contact" has triggered (e.g. contact thermostat or condensate pump)

S.40 Comfort protection mode is active: Product running with limited heating comfort

S.41 Water pressure > 0.6 MPa (6 bar)

S.42 Flue non-return flap response blocks burner operation (only in conjunction with accessory VR40) or condensate pump

defective; heat requirement is blocked

S.44 "Return flow temperature sensor" comfort protection mode is active; product running with limited heating comfort

S.46 "Flame lost at min. output" comfort protection mode is active; product running with limited heating comfort

S.47 "Flame lost at max. output" comfort protection mode is active; product running with limited heating comfort

S.48 "Deviating fan speed" comfort protection mode is active; product running with limited heating comfort

S.53 Product is within the waiting period of the modulation block/operation block function as a result of low water pressure

(flow/return spread too large)

S.54 Product is within the waiting period of the operation blocking function as a result of low water pressure (temperature

gradient)

S.96 Return sensor test running, heating demands are blocked.

S.97 Water pressure sensor test running, heating demands are blocked.

S.98 Flow/return sensor test running, heating demands are blocked.

E Overview of fault codes

Code Meaning Cause

F.00 Flow temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCB

not plugged in correctly, interruption in cable harness, NTC defective

F.01 Return temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCB

not plugged in correctly, interruption in cable harness, NTC defective

F.10 Flow NTC short circuit NTC defective, short circuit in cable harness, cable/casing

F.11 Return NTC short circuit NTC defective, short circuit in cable harness, cable/casing

F.20 Safety switch-off: Temperature limiter Incorrect earth connection between cable harness and product, flow or

return NTC defective (loose connection), black discharge via ignition
cable, ignition plug or ignition electrode

F.22 Safety switch-off: Low water pressure No or insufficient water in the product, water pressure sensor defective,

cable to pump or water pressure sensor loose/not connected/defective

F.23 Safety switch-off: Temperature difference too

great

Pump blocked, insufficient pump output, air in product, flow and return
NTC connected the wrong way round

F.24 Safety switch-off: Temperature rise too fast Pump blocked, insufficient pump output, air in product, system pressure

too low, non-return valve blocked/incorrectly installed

F.25 Safety switch-off: Flue gas temperature too high Break in plug connection for optional flue gas safety temperature limiter

(STB), break in cable harness

F.27 Safety switch-off: Flame simulation Moisture on the electronics, electronics (flame monitor) defective, gas

solenoid valve leaking

F.28 Failure during start-up: Ignition unsuccessful Gas meter defective or gas pressure monitor has triggered, air in gas,

gas flow pressure too low, thermal isolator device (TAE) has triggered,
condensate duct blocked, incorrect gas restrictor, incorrect spare part
gas valve, fault on the gas valve, multiple plug on PCB incorrectly
plugged in, break in cable harness, ignition system (ignition transformer,
ignition cable, ignition plug, ignition electrode) defective, ionisation
current interrupted (cable, electrode), incorrect earthing of product,
electronics defective

F.29 Failure during operation: Re-ignition unsuccess-

ful

Gas supply temporarily stopped, flue gas recirculation, condensate duct
blocked, defective earthing of product, ignition transformer has spark
failure

F.32 Fan fault Plug on fan not correctly plugged in, multiple plug on PCB not correctly

plugged in, break in cable harness, fan blocked, Hall sensor defective,
electronics defective

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 43

Code Meaning Cause

F.34 Safety switch-off: Pressure monitoring Exhaust gas pressure switch: Cable break, blocked flue gas route Water

pressure switch: Hydraulic leakage, air in the heating circuit

F.35 Fault: Air/flue pipe Air/flue pipe blocked

F.49 Fault: eBUS Short circuit on eBUS, eBUS overload or two power supplies with differ-

ent polarities on the eBUS

F.61 Fault: Gas valve regulation – Short circuit/short to earth in cable harness for the gas valve

– Gas valve defective (coils shorted to earth)
– Electronics defective

F.62 Fault: Gas valve switch-off delay – Delayed shutdown of gas valve

– Delayed extinguishing of flame signal
– Gas valve leaking
– Electronics defective

F.63 Fault: EEPROM Electronics defective

F.64 Fault: Electronics/NTC Flow or return NTC short circuited, electronics defective

F.65 Fault: Electronics temp. Electronics overheating due to external influences, electronics defective

F.67 Fault: Electronics/flame Implausible flame signal, electronics defective

F.68 Fault: Unstable flame signal Air in gas, gas flow pressure too low, incorrect air ratio, condensate

duct blocked, incorrect gas restrictor, ionisation flow interruption (cable,
electrode), flue gas recirculation, condensate duct

F.70 Invalid device specific number (DSN) If spare parts were integrated: Display and PCB replaced at the same

time and Device Specific Number not reset; incorrect cable harness;
liquid gas coding resistor and DSN do not match

F.73 Water pressure sensor signal in the wrong range

(too low)

Interruption/short circuit of water pressure sensor, interruption/short
circuit to GND in supply line to water pressure sensor or water pressure
sensor defective

F.74 Water pressure sensor signal outside correct

range (too high)

Line to water pressure sensor has a short circuit to 5 V/24 V or internal
fault in the water pressure sensor

F.75 Fault: No pressure change detection when start-

ing pump

Water pressure sensor and/or pump defective, air in the heating installa­tion, insufficient water in the product; check adjustable bypass, connect
external expansion vessel to the return

F.76 Overheating protection on primary heat ex-

changer has responded

Cable or cable connections for safety fuse in primary heat exchanger or
primary heat exchanger defective

F.77 Fault: Flue non-return flap/condensate pump No response from flue non-return flap or condensate pump defective

Commu­nication
fault

No communication with the PCB Communication fault between display and PCB in the electronics box

F.83 Fault: Flow and/or return temperature sensor

temperature change

When the burner starts, the temperature change registered at the flow
and/or return temperature sensor is non-existent or too small

– Insufficient water in product
– Flow/return temperature sensor not installed correctly

F.84 Fault: Flow/return temperature sensor temperat-

ure difference implausible

Flow/return temperature sensors returning implausible values

– Flow/return temperature sensor not installed correctly

Appendix

44 Installation and maintenance instructions ecoTEC plus 0020134823_04

F Connection diagram

Pump PWM signal

Gas valve

Wate r
pressure sensor

Cylinder sensor (optional)

Cylinder contact
“C1-C2“

Flow sensor

Flow sensor

Flue gas
DD

Safety
cut-out

Safety
cut-out

Remote control circulation pump
External sensor
Flow sensor (optional)
DCF connection
Earth
Earth

Contact thermostat/burner off

Ext. room th. 3-4 (contact, 24 V)
Bus connection

(Controller(room th. digital)

Accessory output
(Select via D.26)

Charging pump

internal pump

Ext. ignition transformer (supply)

Ioni. signal

Unit earth

Mains connection

Unit earth

Fa n

Hall signal

PWM

Earth

Display
connection

white

white

red

blue

blue

pink

Edge connector

blue

pink

white

pink

blue

white

grey

turquoise

green

9

18

3

13
11
14

1

1

15

white

Coding resistor (optional)

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 45

G Initial start-up checklist

Location Competent person Customer Service tech-

nician

Name

Street/house number

Postcode

Town/city

Telephone

Start-up date

Serial number

Hydraulic scheme

G.1 Initial start-up checklist

Yes No Values Unit

System, general

Building type (single/multiple-occupancy house, special
building)

Used for commercial purposes?

Year of manufacture

Insulation status/renovation

System output kW

Previous gas/energy consumption m³ or kWh/a

Heated surface m²

Number of heating circuits

– Underfloor heating circuits
– Radiator heating circuits
– Ventilator heating circuits

Water hardness when starting up mol/m³ or mg/l

CaCO₃

System volume l

Added additive: Designation, amount

Gas supply

Type of gas

Heating value kWh/m³

Gas pressure regulator available?

If yes, which type?

Condensate discharge

Condensate trap filled?

Condensate drain pipework routed with a downward
gradient?

Neutralisation system available (> 200 kW)?

If yes, which manufacturer?

Condensate pump available (if required)?

Condensate pump control line connected?

Hydraulics

Heating circuit system pressure MPa (bar)

Piping at least 1.5 inches (single unit)

Piping at least DN65 (cascade up to 360 kW)

Piping at least DN100 (cascade > 360 kW)

Expansion relief valve MPa (bar)

System separation using a plate heat exchanger

If yes, which type?

Appendix

46 Installation and maintenance instructions ecoTEC plus 0020134823_04

Yes No Values Unit

Low loss header

If yes, which type?

Number of mixers

Cylinder

– Buffer cylinder (if yes, which type?)
– Domestic hot water cylinder (if yes, which type?)

l

Pumps

– Secondary circuit (if yes, which type?)
– Heating circuits (if yes, which type?)

Number of diaphragm expansion tanks

– Primary circuit
– Secondary circuit
– Heating circuits

l

Plate heat exchanger installed correctly?

System sensor installed correctly?

Heating circuits sufficiently purged?

When installing a pump without a pump assembly

Loss of pressure between the pump and the unit < 2 kPa
(20 mbar) at 4 m³/h (required)

Distance between the pump and product is less than

0.5 m (required)

Pump in the return (required)

When using a third-party pump

Pump connected to BMU (signal and voltage) (required)

Pump characteristic line at least in accordance with the
instructions (required)

Hot water supply

Energy source (gas or electricity?)

Via unit circuit

Via heating circuit

Charging pump available?

If yes, which type?

At a cylinder size of < 200 l, the cylinder charging output
is limited to 30 kW (D.070)?

Flue gas guiding

Type of installation (open-flued/room-sealed)

For open-flued installation: Large air intake opening cm²

Element of the air/flue pipe up to the hearth:

– Length
– Diameter

m or mm

Number of elbows fitted

Hearth

– Material
– Height
– Diameter

m or mm

Cascade

Hydr. non-return flaps in the flow line?

Motorised flue non-return flaps wired correctly?

D.027/D.028 (switching of relay 2) to 4 (= extractor hood)
set?

D.090 (eBus controller) detected?

Condensate delivery pump (if required): Fault message
cable connected to each product?

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 47

Yes No Values Unit

Other heat generators

Solar system, heat pump, solid fuel boiler?

If yes, which type?

Control system

Vaillant controller

If yes, which type?

Third-party controller

If yes, which type?

Room thermostat, outside thermostat

If yes, which type?

Heating demand from which controller?

Hot water request from controller (internal/external)

Sensor positioned correctly and connected?

vrnetDIALOG installed correctly, signal available?

Start-up/default settings

CO₂ content at max. via P.1 (before adjustment) Vol. %

CO₂ content at max. via P.1 (after adjustment) Vol. %

Gas flow pressure at nominal heat loading (max. output
for cascades)

kPa (mbar)

CO₂ content at min. via P.2 Vol. %

Gas flow at P

max

via P.1 (if possible) m³/min

Gas flow at P

min

via P.2 (if possible) m³/min

Primary circuit water sample mol/m³ or mg/l

CaCO₃

Secondary circuit water sample mol/m³ or mg/l

CaCO₃

Heating circuit system pressure MPa (bar)

Basic settings

Heating partial load via D.000 kW

Pump overrun via D.001 min

Max. burner anti-cycling time via D.002 min

Pump operating mode via D.018

Max. cylinder charging output via D.077 kW

Appendix

48 Installation and maintenance instructions ecoTEC plus 0020134823_04

H Commissioning Checklist

© Heating and Hotwater Industry Council (HHIC)

www.centralheating.co.uk

Benchmark Commissioning and
Servicing Section

It is a requirement that the boiler is installed and commissioned to the

completed in full.

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 49

This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating
compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.

GAS BOILER SYSTEM COMMISSIONING CHECKLIST

CONTROLS

Optimum start control

Fitted

Fitted

Fitted

Fitted

ALL SYSTEMS

Yes

Yes

CENTRAL HEATING MODE

OR

mbar OR mbar

COMBINATION BOILERS ONLY

Yes

Yes

DOMESTIC HOT WATER MODE

OR

mbar OR mbar

Yes Temperature

CONDENSING BOILERS ONLY

Yes

ALL INSTALLATIONS

AND

²

Ratio

AND

²

Ratio

Yes

Yes

Yes

Yes

Appendix

50 Installation and maintenance instructions ecoTEC plus 0020134823_04

It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed.

Service Provider

SERVICE RECORD

SERVICE 01

AND

²

%

AND

²

%

SERVICE 02

AND

²

%

AND

²

%

SERVICE 03

AND

²

%

AND

²

%

SERVICE 04

AND

²

%

AND

²

%

SERVICE 05

AND

²

%

AND

²

%

SERVICE 06

AND

²

%

AND

²

%

SERVICE 07

AND

²

%

AND

²

%

SERVICE 08

AND

²

%

AND

²

%

SERVICE 09

AND

²

%

AND

²

%

SERVICE 10

AND

²

%

AND

²

%

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 51

I Opening of the flue pipe

G

N

N

MM

A

I

I

O

H

H

C

B

L

J

Q

Q

Q

Q

Q

K

P

D, E

F

I

S

R

T

I.1 Positioning of the opening of a fan-supported flue gas guiding

Installation site

Minimum dimen­sions

A

Directly below an opening, air bricks, opening windows, etc., that can be opened. 300 mm

B Above an opening, air bricks, opening windows, etc., that can be opened. 300 mm

C Horizontally to an opening, air bricks, opening windows, etc., that can be opened. 300 mm

D

Below temperature-sensitive building components, e.g. plastic gutters, down pipes or wastewater
pipes

75 mm

E Below eaves 200 mm

F Below balconies or car port roofs 200 mm

G From vertical wastewater pipes or down pipes 150 mm

H From external or internal corners 200 mm

I Above floors, roofs or balconies 300 mm

J From a surface facing a terminal 600 mm

K From a terminal facing a terminal 1200 mm

L From an opening in the car port (e.g. door, window) which leads into the dwelling 1200 mm

M Vertical from a terminal on the same wall 1500 mm

N Horizontal from a terminal on the same wall 300 mm

O From the wall on which the terminal has been installed 0 mm

P From a vertical structure on the roof N/A

Q Above the roof area 300 mm

R Horizontal from adjacent windows on pitched or flat roofs 600 mm

S Above adjacent windows on pitched or flat roofs 600 mm

T Below adjacent windows on pitched or flat roofs 2000 mm

Appendix

52 Installation and maintenance instructions ecoTEC plus 0020134823_04

I.2 Text from BS 5440-1 on fan-supported flue gas guiding

BS 5440–1: It is recommended that the fanned flue gas system terminal is positioned as follows:

– At least 2 m from an opening in the building directly opposite, and
– So that the combustion products are not discharged directly across a property boundary.
– Dimensions D, E, F and G: These clearances may be reduced to 25 mm without affecting the performance of the boiler.

In order to ensure that the condensate vapour plume does not damage adjacent surfaces, the terminal should be exten­ded as shown.

– Dimension H: This clearance may be reduced to 25 mm without adversely affecting the performance of the boiler. How-

ever, in order to ensure that the condensate vapour plume does not damage adjacent surfaces, a clearance of 300 mm is
preferred. For IE, recommendations are given in the current issue of the IS 813.

I.3 Opening of the flue pipe below eaves and balconies

Balcony/eaves

Gutter

Adequately secured
air/flue gas pipe

The flue pipe must
protrude beyond any overhang

J Treating the heating water

0,0

0,3

0,6

0,9

1,2

1,5

1,8

2,1

2,4

2,7

3

3,3

3,6

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

80 kW

100/120 kW

B

A

x [l]

y [mol/m

3

]

80 kW: A

100/120 kW: B

x System volume [l]

y Water hardness [mol/m³]

A Water treatment required

B Water treatment not required

Appendix

0020134823_04 ecoTEC plus Installation and maintenance instructions 53

K Technical data

Technical data – Output

806 (VU GB 806/5‑5) 1006 (VU GB 1006/5‑5) 1206 (VU GB 1206/5‑5)

Nominal heat output range at 50/30 °C

16.5 … 82.3 kW 20.74 … 102.8 kW 24.7 … 123.4 kW

Nominal heat output range at 60/40 °C

16.0 … 80.0 kW 20.0 … 100.0 kW 24.0 … 120.0 kW

Nominal heat output range at 80/60 °C

14.9 … 74.7 kW 18.7 … 93.3 kW 22.4 … 112.0 kW

Nominal rated efficiency (stationary) at 50/30
°C

108 % 108 % 108 %

Nominal rated efficiency (stationary) at 60/40
°C

105 % 105 % 105 %

Nominal rated efficiency (stationary) at 80/60
°C

98 % 98 % 98 %

Maximum heat input in heating mode (in rela­tion to the heating value Hiand pure heating
mode)

76.2 kW 95.2 kW 114.3 kW

Maximum heat input during cylinder charging

76.2 kW 95.2 kW 114.3 kW

Minimum heat input (in relation to the heating
value Hiand pure heating mode)

15.2 kW 19.2 kW 22.9 kW

Technical data – Heating

806 (VU GB 806/5‑5) 1006 (VU GB 1006/5‑5) 1206 (VU GB 1206/5‑5)

Maximum flow temperature (default setting:
75 °C)

85 ℃ 85 ℃ 85 ℃

Max. flow temperature adjustment range (de­fault setting: 80 °C)

30 … 85 ℃ 30 … 85 ℃ 30 … 85 ℃

Permissible total overpressure

0.6 MPa

(6.0 bar)

0.6 MPa

(6.0 bar)

0.6 MPa

(6.0 bar)

Circulation water volume (with reference to
ΔT= 23 K)

2,990 l/h 3,740 l/h 4,485 l/h

Approx. condensate rate (pH value 3.5 … 4.0)
in 40/30 °C heating mode

12.8 l/h 16.0 l/h 19.2 l/h

Remaining feed head of the modulating pump
with pump group

0.042 MPa

(0.420 bar)

0.026 MPa

(0.260 bar)

0.024 MPa

(0.240 bar)

Technical data – General

806 (VU GB 806/5‑5) 1006 (VU GB 1006/5‑5) 1206 (VU GB 1206/5‑5)

Designated country (designation in accord­ance with ISO 3166)

GB (Great Britain), IE
(Ireland)

GB (Great Britain), IE
(Ireland)

GB (Great Britain), IE
(Ireland)

Approval category

II

2H3P

II

2H3P

II

2H3P

Gas connection, boiler side

R 1 R 1 R 1

Flow/return heating connections, boiler side

G 1 1/4" G 1 1/4" G 1 1/4"

G20 natural gas flow pressure

2.0 kPa

(20.0 mbar)

2.0 kPa

(20.0 mbar)

2.0 kPa

(20.0 mbar)

Gas flow rate at 15 °C and 1013 mbar (based
on hot water generation if applicable), G20
(Hi= 9.5 kWh/m³)

8.0 m³/h 10.1 m³/h 12.1 m³/h

Min. flue gas mass rate (G20)

6.9 g/s 8.9 g/s 10.6 g/s

Max. flue gas mass rate

34.4 g/s 43.6 g/s 52.5 g/s

Min. flue gas temperature

40 ℃ 40 ℃ 40 ℃

Max. flue gas temperature

85 ℃ 85 ℃ 85 ℃

Approved flue gas connections

C13, C33, C43, C53,
C93, B23, B53, B53P

C13, C33, C43, C53,
C93, B23, B53, B53P

C13, C33, C43, C53,
C93, B23, B53, B53P

Additional approved flue gas connections

B23p B23p B23p

Permitted pressure difference in the flue pipe
for installation type B23p as a single occu­pancy max.

150 Pa

(0.00150 bar)

200 Pa

(0.00200 bar)

200 Pa

(0.00200 bar)

Appendix

54 Installation and maintenance instructions ecoTEC plus 0020134823_04

806 (VU GB 806/5‑5) 1006 (VU GB 1006/5‑5) 1206 (VU GB 1206/5‑5)

Permitted pressure difference in the flue pipe
for installation type B23p as cascade opera­tion max.

50 Pa

(0.00050 bar)

50 Pa

(0.00050 bar)

50 Pa

(0.00050 bar)

Air/flue gas connection

110/160 mm 110/160 mm 110/160 mm

NOx class

5 5 5

NOx emissions

≤ 40 mg/kW⋅h ≤ 40 mg/kW⋅h ≤ 40 mg/kW⋅h

CO emissions

≤ 30 mg/kW⋅h ≤ 30 mg/kW⋅h ≤ 30 mg/kW⋅h

CO₂ content min. volume

8.8 vol% 9.0 vol% 9.0 vol%

CO₂ content max. volume

9.0 vol% 9.0 vol% 9.0 vol%

Boiler dimension, width

480 mm 480 mm 480 mm

Boiler dimension, height

960 mm 960 mm 960 mm

Boiler dimension, depth

603 mm 603 mm 603 mm

Approx. net weight without pump group

68 kg 86 kg 90 kg

Technical data – Electrical

806 (VU GB 806/5‑5) 1006 (VU GB 1006/5‑5) 1206 (VU GB 1206/5‑5)

Electric connection

230 V/50 Hz 230 V/50 Hz 230 V/50 Hz

Built-in fuse (slow-blow)

4 A 4 A 4 A

Min. electrical power consumption

25 W 18 W 18 W

Max. electrical power consumption

122 W 160 W 160 W

Standby electrical power consumption

< 2 W < 2 W < 2 W

Level of protection

IP X4 D IP X4 D IP X4 D

Test symbol/registration no.

CE‑ 0085CM0415 CE‑ 0085CM0415 CE‑ 0085CM0415

Index

0020134823_04 ecoTEC plus Installation and maintenance instructions 55

Index

A

Air index setting...................................................................23

Air/flue pipe .........................................................................14

Air/flue pipe, installed ............................................................ 4

Appliance config. ................................................................. 19

Automatic air vent................................................................ 20

Auxiliary relay ...................................................................... 19

B

Burner............................................................................30, 33

Burner anti-cycling time....................................................... 26

C

Casing, upper ...................................................................... 10

CE label.................................................................................8

Check programme............................................................... 19

Check programmes ................................................. 17, 19, 32

Circulation pump ................................................................. 17

CO₂ content ......................................................................... 23

Combustion air ......................................................................6

Comfort mode...................................................................... 19

Comfort protection mode..................................................... 32

Competent person ................................................................. 4

Competent person telephone number ................................. 19

Component test ................................................................... 27

Condensate drain pipework.................................................14

Condensate trap ............................................................ 21, 30

Connection dimensions ......................................................... 9

Controller............................................................................. 16

Corrosion............................................................................... 6

D

Decommissioning................................................................ 35

Deleting, fault list ................................................................. 32

Diagnostics.......................................................................... 32

Diagnostics codes .........................................................25, 38

Display.................................................................................34

Disposal, packaging ............................................................35

Disposing of the packaging ................................................. 35

Documents ............................................................................7

Draining ............................................................................... 31

E

Electricity ............................................................................... 5

Electronics self-test .............................................................28

Expansion relief valve ......................................................... 14

F

Fan ......................................................................................34

Fault codes....................................................................32, 42

Fault list ............................................................................... 32

Fault memory ...................................................................... 32

Fault symbol ........................................................................ 19

Filling ................................................................................... 20

Filling mode ......................................................................... 19

Filling pressure .................................................................... 20

Flow temperature, maximum............................................... 25

Flue gas route .......................................................................4

Front casing......................................................................... 10

Front casing, closed .............................................................. 4

Frost ......................................................................................6

Function menu.....................................................................27

G

Gas connection ................................................................... 11

Gas conversion ................................................................... 21

Gas ratio setting .................................................................. 21

Gas valve ............................................................................33

Gas-air mixture unit ....................................................... 28, 30

H

Heat exchanger ............................................................. 29, 34

Heating flow......................................................................... 12

Heating installation .............................................................. 20

Heating partial load ....................................................... 19, 25

Heating return...................................................................... 12

Hot water temperature......................................................... 19

I

Identification plate ................................................................. 8

If you smell gas .....................................................................5

Inspection work ....................................................... 26, 31, 40

Installation assistant ............................................................ 19

Installation clearances........................................................... 9

Installation site................................................................... 4, 6

Installer level ....................................................................... 17

Insulating mat ...................................................................... 34

Intended use..........................................................................4

L

Language ............................................................................ 19

Live Monitor.........................................................................17

M

Mains connection ................................................................ 15

Maintenance interval ...........................................................26

Maintenance work ...................................................26, 31, 40

Minimum clearances ............................................................. 9

Multi-functional module ....................................................... 19

O

Operating concept ............................................................... 17

P

Parameters.......................................................................... 32

PCB ..................................................................................... 34

Power supply.......................................................................15

Preparing, repair work ......................................................... 32

Pressure .............................................................................. 20

Product ................................................................................ 26

Product dimensions............................................................... 9

Pump operating mode ....................................................... 25

Pump overrun......................................................................25

Purging ................................................................................ 20

Q

Qualification...........................................................................4

R

Regulations ........................................................................... 6

Repair............................................................................32, 35

Replacing the burner ........................................................... 33

Replacing, display ...............................................................34

Replacing, fan ..................................................................... 34

Replacing, gas valve ...........................................................33

Replacing, heat exchanger..................................................34

Replacing, PCB ................................................................... 34

Resetting the remaining burner anti-cycling time ................ 26

Resetting, fault memory ...................................................... 32

Resetting, parameters ......................................................... 32

Return flow temperature control .......................................... 25

Risk of scalding ..................................................................... 5

S

Safety device.........................................................................5

Schematic drawing ................................................................ 5

Scope of delivery...................................................................8

Index

56 Installation and maintenance instructions ecoTEC plus 0020134823_04

Self-test ...............................................................................27

Service message................................................................. 32

Service partner .................................................................... 32

Setting the pump output ...................................................... 26

Side section.........................................................................11

Spare parts..........................................................................27

Status codes.................................................................. 17, 41

Switching on ........................................................................ 19

T

Target feed temperature...................................................... 19

Test programmes ................................................................17

Tool ....................................................................................... 5

Transport ............................................................................... 5

Treating the heating water................................................... 18

V

Voltage ..................................................................................5

W

Weight .................................................................................10

0020134823_04 18.02.2016

Vaillant Ltd.

Nottingham Road Belper Derbyshire DE56 1JT
Telephone [phone]

[e-mail] www.vaillant.co.uk

© These instructions, or parts thereof, are protected by copyright and may be reproduced or distributed only with
the manufacturer's written consent.

We reserve the right to make technical changes.