Vaillant ecoTEC exclusive 627 (VU 256/5-7 (H-GB)) | 835 (VUW 356/5-7 (H-GB)) | 843 (VUW 436/5-7 (H-GB)) OPERATING INSTRUCTIONS (0020193967_02 01.08.2019)

Operating instructions

Publisher/manufacturer
Vaillant GmbH

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

ecoTEC exclusive

627 (VU 256/5‑7 (H-GB))

835 (VUW 356/5‑7 (H-GB))

843 (VUW 436/5‑7 (H-GB))

GB, IE

Contents

Contents

1 Safety .................................................................... 3

1.1 Action-related warnings ......................................... 3

1.2 Intended use.......................................................... 3

1.3 General safety information .................................... 3

2 Notes on the documentation .............................. 5

2.1 Observing other applicable documents ................. 5

2.2 Storing documents................................................. 5

2.3 Validity of the instructions...................................... 5

3 Product description............................................. 5

3.1 Product design....................................................... 5

3.2 Control elements.................................................... 5

3.3 Operator control panel........................................... 5

3.4 Displayed symbols................................................. 6

3.5 Information on the identification plate.................... 6

3.6 Serial number ........................................................ 6

3.7 CE marking ............................................................ 6

3.8 Benchmark............................................................. 6

3.9 Energy Saving Trust Endorsed Products .............. 7

4 Operation.............................................................. 7

4.1 Operating concept ................................................. 7

4.2 Basic display.......................................................... 7

4.3 Menu display.......................................................... 7

4.4 Operating levels..................................................... 7

4.5 Cabinet-type casing............................................... 8

4.6 Opening the isolator devices ................................. 8

4.7 Starting up the product .......................................... 8

4.8 Switching on the product ....................................... 8

4.9 Setting the language.............................................. 8

4.10 Setting the domestic hot water temperature.......... 8

4.11 Switching Comfort mode on and off ...................... 8

4.12 Setting the heating flow temperature..................... 9

4.13 Switching Green iQ mode on and off .................... 9

4.14 Guaranteeing the correct filling pressure of the

heating installation................................................. 9

4.15 Switching off the product's functions ................... 10

4.16 Protecting the heating installation against

frost...................................................................... 10

5 Detecting and rectifying faults ......................... 11

6 Calling up (Live monitor) status codes ........... 11

7 Care and maintenance ...................................... 11

7.1 Maintenance ........................................................ 11

7.2 Caring for the product .......................................... 11

7.3 Reading maintenance messages ........................ 11

7.4 Checking the condensate drain pipework and

tundish ................................................................. 11

8 Decommissioning.............................................. 11

8.1 Temporarily decommissioning the product.......... 11

8.2 Permanently decommissioning the product......... 11

9 Recycling and disposal..................................... 11

10 Guarantee and customer service..................... 12

10.1 Guarantee............................................................ 12

10.2 Customer service................................................. 12

Appendix ............................................................................13

A Operator level – overview ................................. 13

B Troubleshooting ................................................ 13

C Status codes – Overview .................................. 14

2 Operating instructions ecoTEC exclusive 0020193967_02

Safety 1

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 do­mestic hot water generation.

Intended use includes the following:

– observance of the operating instructions

included for the product and any other
installation components

– compliance with all inspection and main-

tenance conditions listed in the instruc­tions.

This product can be used by children aged
from 8 years and above and persons with
reduced physical, sensory or mental capabil­ities or lack of experience and knowledge if
they have been given supervision or instruc­tion concerning use of the product in a safe
way and understand the hazards involved.
Children must not play with the product.
Cleaning and user maintenance work must
not be carried out by children unless they are
supervised.

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 Installation by competent persons only

The installation, inspection, maintenance
and repair of the product, as well as the gas
ratio settings, must only be carried out by a
competent person.

1.3.2 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.

1.3.3 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 stopcock 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 Emergency Service provider
[phone] by telephone once you
are outside of the building.

0020193967_02 ecoTEC exclusive Operating instructions 3

1 Safety

1.3.4 Risk of death due to blocked or leaking flue pipework

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.
▶ Inform a competent person.

1.3.5 Risk of death due to explosive and flammable materials

▶ Do not use the product in storage rooms

that contain explosive or flammable sub­stances (such as petrol, paper or paint).

1.3.6 Risk of death due to changes to the product or the product environment

▶ Never remove, bridge or block the safety

devices.

▶ Do not tamper with any of the safety

devices.

▶ Do not damage or remove any tamper-

proof seals on components.

▶ Do not make any changes:

– The product itself
– to the gas, supply air, water and electri-

city supply lines

– to the entire flue system
– to the entire condensate discharge sys-

tem

– to the expansion relief valve
– to the drain pipework
– to constructional conditions that may

affect the operational reliability of the
product

▶ Ensure that the combustion air supply is

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

▶ Ensure that no chemical substances are

stored at the installation site.

1.3.9 Risk of material damage caused by frost

▶ Ensure that the heating installation always

remains in operation during freezing con­ditions and that all rooms are sufficiently
heated.

▶ If you cannot ensure the operation, have a

competent person drain the heating install­ation.

1.3.10 Risk of injury and material damage

due to maintenance and repairs
carried out incorrectly or not carried
out at all

▶ Never attempt to carry out maintenance

work or repairs on your product yourself.

▶ Faults and damage should be immediately

rectified by a competent person.

▶ Adhere to the maintenance intervals spe-

cified.

1.3.7 Risk of poisoning caused by insufficient combustion air supply

Condition: Open-flued operation

▶ Ensure that there is a sufficient combus-

tion air supply.

1.3.8 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.

4 Operating instructions ecoTEC exclusive 0020193967_02

Notes on the documentation 2

1

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3

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4 3 2 1

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2 Notes on the documentation

2.1 Observing other applicable documents

▶ You must observe all operating instructions enclosed with

the system components.

2.2 Storing documents

▶ Keep this manual and all other applicable documents

safe for future use.

2.3 Validity of the instructions

These instructions apply only to:

Product article number

627 (VU 256/5‑7 (H-GB))
ecoTEC exclusive

835 (VUW 356/5‑7 (H­GB)) ecoTEC exclusive

843 (VUW 436/5‑7 (H­GB)) ecoTEC exclusive

Article num­ber

0010017063 41-694-02

0010017064 47-044-66

0010017065 47-044-67

Gas Council
Number

3.2 Control elements

1 On/off button

2 Built-in controller (ac-

cessory)

3 Reset button

4 Operating buttons

5 Display

3.3 Operator control panel

3 Product description

3.1 Product design

1 Control elements

2 Plate with serial number

on the rear

3 Front flap

1 Current heating flow

temperature, filling
pressure of the heating
installation, operating
mode, fault code or
additional information

2 Current assignment of

the right-hand selection
button

3 Left- and right-hand

selection buttons

4 and button

5 Maximum output op-

eration (for chimney
sweeps only)

6 Access to the menu for

additional information

7 Current assignment of

the left-hand selection
button

8 Active operating status

The display lights up

– if you switch on the product or

0020193967_02 ecoTEC exclusive Operating instructions 5

3 Product description

bar

F. X X

– if you press a button while the product is switched on.

At first, pressing this button does not trigger any other
function.

The light goes out after one minute if you do not press any
button.

3.4 Displayed symbols

Symbol Meaning Explanation

Burner operating cor­rectly

Current burner modula­tion rate

Current filling pressure of
the heating system

The dashed lines show
the permitted range.

Hot water generation
active

Heating mode active – Permanently on:

Green iQ mode active – Permanently on:

Maintenance required Information on mainten-

Summer mode active

Heating mode is
switched off

Burner anti-cycling time
is active

Fault in the product Appears instead of the

Burner on

– Permanently on:

Filling pressure in
the permitted range.

– Flashing: Filling

pressure outside
the permitted range.

– Permanently on:

Draw-off mode be­fore burner is on

– Flashing: Burner on

in draw-off mode

Heating mode heat
requirement

– Flashing: Burner on

in heating mode

Energy-saving mode
active

ance message in the
"Live Monitor".

To avoid the need for
frequent switching on
and off (increases the
product's working life).

basic display, may be
an explanatory plain text
display.

3.5 Information on the identification plate

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

Validity: Product with integrated hot water generation

OR Product with integrated hot water generation

Information on the
identification plate

VU(W) ... Type designation

..6/5-7 Calorific value power/product generation

ecoTEC exclusive Product description

Meaning

Read the instructions.

equipment

Information on the
identification plate

2H, G20 – 20 mbar
(2.0 kPa)

ww/yyyy Date of manufacture: Week/year

Cat. Approved unit categories

Types Approved gas-fired units

PMS Permissible total overpressure in heating

PMW Permissible total overpressure during hot

T

max.

ED 92/42 Current efficiency directive fulfilled with

V Hz Mains voltage and mains frequency

W Max. electrical power consumption

IP Level of protection

P Nominal heat output range

Q Heat input range

D Nominal hot water draw-off rate

Meaning

Gas group and gas connection pressure
as set at the factory

mode

water generation

Max. flow temperature

4* rating

Heating mode

Hot water generation

Bar code with serial number,

7th to 16th digit = product article number

3.6 Serial number

The serial number is located on a plate behind the front flap.
The plate is in a plastic fish plate. You can also display the
serial number in the display.

3.7 CE marking

The CE marking shows that the products comply with the
basic requirements of the applicable directives as stated on
the declaration of conformity.

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

3.8 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.

6 Operating instructions ecoTEC exclusive 0020193967_02

Operation 4

50

Xxxx
Xxxxxxxxxxx

Xxxx Xxxxxxx

Xxxxxxxxxx

xxxxxx Xxxxxxx

1

4

3

2

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

For more information visit www.centralheating.co.uk

3.9 Energy Saving Trust Endorsed Products

Only the most energy efficient products can carry the
‘Energy Saving Trust Endorsed Product’ brandmark making
it easy for consumers to choose products that have met strict
energy performance criteria.

Available for: Boilers, Heating controls and chemical inhib­itors, the Energy Saving Trust endorsed product brandmark
gives consumers confidence that a product will cost less to
run, help lower energy bills and reduce carbon emissions.

About the Energy Saving Trust

Energy Saving Trust is an independent and impartial organ­isation that provides trusted energy saving advice to em­power millions of people to lead affordable, low energy life­styles. For more information visit energysavingtrust.org.uk

You must always confirm a change to a value. Only then is
the new setting saved. You can press to cancel a proced­ure.

4.2 Basic display

The basic display shows the current condition of the product.
If you press a selection button, the activated function is dis­played in the display.

The functions that are available depend on whether a con­troller is connected to the product.

You can switch back to the basic display by:

– Pressing to exit the selection levels
– Not pressing any button for longer than 15 minutes.

If there is an error message present, the basic displays
switches to the error message.

4.3 Menu display

4 Operation

4.1 Operating concept

Operator
control
element

+ at
the same
time

or

The current function of the and buttons is shown in
the display.

Adjustable values are always displayed as flashing.

Function

– Setting the hot water temperature
– Cancelling the activation of an operating

mode

– Cancelling a change to a set value
– Going one selection level higher

– Setting the heating flow temperature
– Reading the system pressure
– Activating the comfort mode
– Activating the operating mode
– Confirm setting
– Going one selection level lower

– Calling up the menu

– Reducing or increasing the set value
– Scrolling through menu entries

1 Scroll bar

2 Current assignment of

the and buttons.

You can find an overview of the menu structure in the ap­pendix.

Operator level – overview (→ Page 13)

3 Selection level list

entries

4 Name of the selection

level

4.4 Operating levels

The product has two operating levels.

The operating level for the operator shows information and
offers set-up options that do not require any special prior
knowledge.

The operating level for the competent person is protected by
a code.

Operator level – overview (→ Page 13)

0020193967_02 ecoTEC exclusive Operating instructions 7

4 Operation

50

2

1

4.5 Cabinet-type casing

Enclosing the product in cabinet-type casing requires compli­ance with the applicable design instructions.

If you require cabinet-type casing for your product, consult
a heating specialist company. Never, under any circum­stances, enclose the product yourself.

4.6 Opening the isolator devices

1. Ask the competent person who installed the product to
explain to you where these isolators are located and
how to handle them.

2. Open the gas stopcock fully.

3. Open the service valves in the heating installation's flow
and return.

Validity: Product with integrated hot water generation

▶ Open the cold-water isolation valve.

4.7 Starting up the product

▶ Only start up the product once the casing has been com-

pletely closed.

4.8 Switching on the product

4.10 Setting the domestic hot water temperature

Danger!
Risk of death from legionella.

Legionella multiply at temperatures below
60 °C.

▶

Have a competent person inform you
about the measures that should be taken
to protect against Legionella in your in­stallation.

▶ Do not set any water temperatures below

60 °C without consulting the competent
person first.

1. Press ( ).

◁ The set domestic hot water temperature flashes in

the display.

Condition: No control connected

▶ Change the domestic hot water temperature by pressing

or .

▶ Confirm by pressing .

Condition: Controller connected

▶ Press the on/off button (1).

◁ The "Basic display" (→ Page 7) (2) appears on the

display.

4.9 Setting the language

1. Press and hold and at the same time.

2. Also briefly press .

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

4. Select the required language by pressing or .

5. Confirm by pressing .

6. Once you have set the correct language, press
again to confirm this.

▶ Use to set the maximum possible domestic hot water

temperature on the product.

▶ Confirm by pressing .
▶ Set the required domestic hot water temperature on the

control (→ Control operating instructions).

4.11 Switching Comfort mode on and off

Validity: Product with integrated hot water generation

Note

Comfort mode immediately supplies hot water at
the required temperature, without you having to
wait for the water to heat up.

1. Press ( ).

2. Press ( ).

◁ Comfort on or Comfort off are shown flashing in

the display.

3. Activate or deactivate Comfort mode by pressing or
respectively.

4. Press to confirm this change.

◁ When you have activated Comfort mode, the " "

symbol appears on the basic display. When you
have deactivated Comfort mode, the " " symbol
goes out on the basic display.

8 Operating instructions ecoTEC exclusive 0020193967_02

Operation 4

4.12 Setting the heating flow temperature

1. Press ( ).

◁ The target value of the heating flow temperature

appears on the display.

Note

The competent person may have adjusted
the maximum possible temperature.

Condition: No controller connected

▶ Use or to set the required heating flow temperat-

ure.

▶ Confirm by pressing .

Condition: Controller connected

▶ Set the maximum possible heating flow temperature on

the product.

▶ Confirm by pressing .
▶ Set the required heating flow temperature on the control-

ler (→ Controller operating instructions).

4.13 Switching Green iQ mode on and off

Note
Green iQ mode is an energy-saving operating

mode. If this mode is activated, the product oper­ates in the heating and cylinder charging mode in
such a way that the maximum benefits associated
with condensing technology are achieved.

1. Press

and at the same time.

◁ The menu is called up.

2. Navigate to the Green iQ menu item and press .

– Menu → Basic settings → Green iQ

3. Press or to activate or deactivate Green iQ
mode respectively.

◁ Mode on or Mode off will flash on the display.

4. Confirm by pressing .

◁ If you have activated Green iQ mode, the symbol

will appear on the basic display. If you have deactiv­ated Green iQ mode, the symbol will disappear
from the basic display.

4.14 Guaranteeing the correct filling pressure of the heating installation

4.14.1 Checking the filling pressure of the heating installation

Note

To ensure that the heating installation operates
smoothly, the filling pressure when the heating
installation is cold must be between 0.1 MPa and

0.2 MPa (1.0 bar and 2.0 bar) or lie between the
two dashed lines in the bar graph display.

If the heating installation extends over several
storeys, a higher filling pressure may be required
for the heating installation. Ask a competent per­son for details.

In addition, the symbol appears after approx.
one minute.

If the filling pressure in the heating installation
falls below 0.05 MPa (0.5 bar), then the product
switches off. The display alternates between the
fault message F.22 and the current filling pres­sure.

1. Press twice.

◁ The values for the current filling pressure and for the

minimum and maximum filling pressures appear in
the display.

2. Check the filling pressure in the display.

Result 1:

System pressure: 0.1 to 0.2 MPa (1.0 to 2.0 bar)
The filling pressure is in the intended pressure range.

Result 2:

Filling pressure: < 0.08 MPa (< 0.80 bar)

▶ Fill the heating installation. (→ Page 9)

◁ If you have topped up the installation with suf-

ficient heating water, the display automatically
disappears after 20 seconds.

4.14.2 Filling the heating installation

Caution.
Risk of material damage due to heating

water that is extremely calciferous or cor­rosive or contaminated by chemicals.

Unsuitable tap water damages the seals
and diaphragms, blocks components in the
product and heating installation through
which the water flows and causes noise.

▶ Only fill the heating installation with suit-

able heating water.

▶ In case of doubt, ask a competent person

for details.

1. Ask a competent person where the filling cock is loc-

ated.

2. Open all radiator valves (thermostatic radiator valves) of

the heating installation.

0020193967_02 ecoTEC exclusive Operating instructions 9

4 Operation

A

B

1

4

3

2

Condition: Product for heating mode only

▶ Connect the filling cock to a hot water supply in the way

you were told by the competent person.

▶ Open the hot water supply.
▶ Turn the filling cock on slowly and allow water to flow in

until the required filling pressure has been reached.

▶ Close the hot water supply.
▶ Purge all radiators.
▶ Check the filling pressure in the display.
▶ Top up with more water if necessary.
▶ Close the hot water supply.

Condition: Product with integrated hot water generation and filling loop

4.15 Switching off the product's functions

4.15.1 Switching off hot water generation

Validity: Product with hot water generation through external domestic hot

water cylinder

1. To switch off cylinder charging without switching off
heating mode, press ( ).

◁ The set hot water temperature flashes in the display.

2. Use the button to set the hot water temperature to
Cylinder charging off.

3. Confirm by pressing .

◁ Cylinder charging is switched off.
◁ Only the frost protection function for the cylinder

remains active.

4.15.2 Switching off heating mode (Summer mode)

1. To switch off heating mode without switching off hot
water generation, press ( ).

◁ The value of the heating flow temperature appears

in the display.

2. Use the button to set the heating flow temperature to
Heating off.

3. Confirm by pressing .

◁ Heating mode is switched off
◁ The symbol appears in the display.

4.16 Protecting the heating installation against

frost

4.16.1 Frost protection function

Caution.

▶ Fit the double non-return valve (1) of the filling line to

the cold water stop valve and secure the valve with the
spring clip (2).

▶ To fill, first open the stop valve (3).
▶ Slowly open the stop valve (4) so that the water flows

into the heating system. Fill it with water until the re­quired filling pressure is reached.

▶ Close the stop valve (4).
▶ Purge all radiators.
▶ Check the filling pressure in the display.
▶ Top up with more water if necessary.

Risk of material damage due to frost.

The frost protection function cannot guaran­tee flow through the entire heating installa­tion, which means that parts of the heating in­stallation may freeze and therefore become
damaged.

▶ During a period of frost, ensure that the

heating installation remains in operation
and that all rooms are sufficiently heated,
even when you are away.

▶ After filling, close both stop valves and disconnect the

filling device by removing the double non-return valve
from the cold water stop valve.

3. Return to the basic display. (→ Page 7)

Note

Both stop valves must be closed while the
heating system is operating and the filling line
must be removed from the double non-return
valve again.

If the heating flow temperature falls below 5 °C when the
on/off button is on, the product comes into operation and
heats the circulating water to approx. 30 °C on both the heat­ing side and the hot water side (if available).

4.16.2 Draining the heating installation

Note

To keep the frost protection devices active, you
should switch your product on and off using the
controller, if one is provided.

Another way to protect the heating installation and the

10 Operating instructions ecoTEC exclusive 0020193967_02

product from frost for very long switch-off times is to drain
them completely.

▶ Consult a competent person about this.

Detecting and rectifying faults 5

5 Detecting and rectifying faults

▶ If faults occur, proceed in accordance with the table in

the appendix.
Troubleshooting (→ Page 13)

▶ If you are unable to eliminate the faults using the spe-

cified measures, if fault messages (F.xx) are displayed,
or if the product does not function correctly, contact a
competent person.

6 Calling up (Live monitor) status codes

1. Press and at the same time.

◁ The menu is called up.

2. Navigate to Menu → Live monitor and confirm by

pressing .
Status codes – Overview (→ Page 14)

7 Care and maintenance

7.1 Maintenance

An annual inspection of the product carried out by a compet­ent person is a prerequisite for ensuring that the product is
permanently ready and safe for operation, reliable, and has a
long working life.

After servicing, complete the relevant service interval record
section of the benchmark checklist, located at the rear of the
installation manual.

7.2 Caring for the product

Caution.
Risk of material damage caused by un-

suitable cleaning agents.

7.4 Checking the condensate drain pipework and tundish

The condensate drain pipework and tundish must always be
penetrable.

▶ Regularly check the condensate drain pipework and tun-

dish for faults and, particularly, for blockages.

You must not be able to see or feel any obstructions in the
condensate drain pipework and tundish.

▶ If you notice a fault, have it rectified by a competent per-

son.

8 Decommissioning

8.1 Temporarily decommissioning the product

Caution.
Risk of material damage due to frost.

The frost protection and monitoring devices
are only active while the product is connected
to the power mains and switched on via the
on/off button, and when the gas isolator cock
is open.

▶ Temporarily decommission the product

only if no frost is expected.

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

◁ The display goes out.

2. When decommissioning the product for an extended

period (e.g. holiday), also close the gas isolator cock.

8.2 Permanently decommissioning the product

▶ Have a competent person permanently decommission

the product.

▶ Do not use sprays, scouring agents, de-

tergents, solvents or cleaning agents that
contain chlorine.

▶ Clean the casing with a damp cloth and a little solvent-

free soap.

7.3 Reading maintenance messages

If the symbol is shown in the display, the product requires
maintenance work. The product is not in fault mode; it contin­ues to operate.

▶ Consult a competent person.
▶ If the water pressure is flashing at the same time, simply

add more heating water.

9 Recycling and disposal

▶ The competent person who installed your product is re-

sponsible for the disposal of the packaging.

If the product is labelled with this mark:

▶ In this case, do not dispose of the product with the

household waste.

▶ Instead, hand in the product to a collection centre for

waste electrical or electronic equipment.

If the product contains batteries that are labelled with
this mark, these batteries may contain substances that are
hazardous to human health and the environment.

▶ In this case, dispose of the batteries at a collection point

for batteries.

0020193967_02 ecoTEC exclusive Operating instructions 11

10 Guarantee and customer service

10 Guarantee and customer service

10.1 Guarantee

– Two year guarantee

Vaillant provides this appliance with a parts and labour
guarantee against defects that may occur within twenty­four months of the installation date. For the 2nd year of the
guarantee to be valid an annual service must be carried out
by a competent person approved at the time by the Health
and Safety Executive one year after installation. The cost of
this annual service is not included in the guarantee.

– Registering with us

Registration is simple. Just complete the Guarantee Regis­tration Card and return to Vaillant within 30 days of installa­tion. Your details will then be automatically registered within
the Vaillant scheme.

– Immediate help

If your Vaillant boiler develops a fault your first action should
be to contact your installer, as his professional assessment
is needed under the terms of our Guarantee. If you are un­able to contact your installer, phone Vaillant Service Solu­tions:

Telephone: [phone]

10.2 Customer service

To ensure regular servicing, it is strongly recommended
that arrangements are made for a Maintenance Agreement.
Please contact Vaillant Service Solutions for further details:

Telephone: [phone]

12 Operating instructions ecoTEC exclusive 0020193967_02

Appendix

A Operator level – overview

Appendix

Setting level Values Unit Increment, select Default

Min. Max.

Water pressure →

Water pressure Current value bar

Live monitor →

Status Current value

Information →

Contact details Phone number

Serial number Permanent value

Display contrast Current value 1 25

15 40

comDIALOG Current value No function

Basic settings →

Language Current language Languages available for selection Country-

Green iQ Current value On, Off On

Display contrast Current value 1 25

15 40

Resets →

Reset anti-cycl. time Current value min

setting

specific

B Troubleshooting

Fault Cause Measure

Product does not start
up:

– No hot water
–

Heating remains cold

The gas isolator cock installed on-site and/or the gas
isolator cock on the product is closed.

The cold water stop valve is closed. Open the cold water stop valve.

The power supply in the building is disconnected. Check the fuse in the building. The product

The product is switched off. Switch on the product (→ "Switching on the

The heating flow temperature is set too low or to the
Heating off position, and/or the hot water temperature
is set too low.

The system pressure is insufficient.

Low water pressure in the heating installation (fault mes­sage: F.22).

There is air in the heating installation. Have your competent person purge the heating

After three unsuccessful attempts to ignite the flame, the
product switches to fault mode (fault message: F.28).

Open both gas isolator cocks.

switches on automatically when the power is
restored.

product" section).

Set the heating flow temperature and hot water
temperature (→ "Setting the heating flow temper­ature" section/→ "Setting the hot water temperat­ure" section).

Fill the heating installation (→ "Filling the heating
installation" section).

installation.

Press the reset button for one second. The
product makes another attempt to ignite the
flame.

If you have been unable to eliminate the ignition
fault after three reset attempts, consult a com­petent person.

0020193967_02 ecoTEC exclusive Operating instructions 13

Appendix

Fault Cause Measure

Product does not start
up:

– No hot water
– Heating remains cold

Hot water generation
functioning correctly;
heating does not start
up.

C Status codes – Overview

Status codes that are not listed here can be viewed in the installation instructions.

Status code Meaning

Displays in heating mode

S.00 Heating: No heat demand

S.01 Heating mode: Fan start-up

S.02 Heating mode: Pump prerun

S.03 Heating mode: Ignition

S.04 Heating mode: Burner on

S.05 Fan and pump overrun

S.06 Heating mode: Fan overrun

S.07 Heating mode: Pump overrun

S.08 Heating, remaining anti-cycling time xx mins

S.09 Heating mode: Measuring programme

Domestic hot water mode (products with integrated domestic hot water generation)

S.10

S.11

S.13

S.14

S.15

S.16

S.17

S.19 DHW mode: Measuring programme

Comfort mode, warm start or domestic hot water mode with actoSTOR or cylinder charging mode

S.20 Domestic hot water requirement

S.21 DHW mode: Fan start-up

S.22 DHW mode: Pump prerun

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 DHW mode: Pump overrun

S.28 Domestic hot water burner anti-cycling time

S.29 DHW mode: Measuring programme

Other displays

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

S.31 Summer mode active

S.34 Frost protection mode, frost protection

S.37 Waiting period: Deviation in fan speed

S.40 Comfort protection mode active

S.57 Waiting period: Measuring programme

There is a fault in the flue gas route (fault message:
F.36/F.37):

– The symbols XXXXX are shown in the display.
– The red LED is lit continuously.

The external controller is not set correctly. Set the external controller correctly (→ Controller

Domestic hot water requirement via impeller sensor

DHW mode: Fan start-up

DHW mode: Ignition

DHW mode: Burner on

DHW mode: Pump/fan overrun

DHW mode: Fan overrun

DHW mode: Pump overrun

Have your competent person rectify the fault.

operating instructions).

14 Operating instructions ecoTEC exclusive 0020193967_02

Status code Meaning

S.58 Modulation limitation due to noise/wind

S.76 System pressure too low. Top up water.

Appendix

0020193967_02 ecoTEC exclusive Operating instructions 15

0020193967_02

0020193967_02 01.08.2019

Supplier

Vaillant Ltd.

Nottingham Road Belper 1 1 Derbyshire 1 1 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.

Subject to technical modifications.