DeDietrich Innovens MCA 28 BIC, Innovens MCA 25 BIC User Manual

Innovens

EN

Wall-hung gas condensing boilers

MCA 35

User Guide

300022163-001-01

Contents

1 Introduction ................................................................................................4

1.1 Symbols used .......................................................4

1.2 Abbreviations ........................................................4

1.3 General ..................................................................5

1.3.1 Manufacturer's liability .............................................5

1.3.2 Installer's liability .....................................................5

1.3.3 User's liability ..........................................................5

1.4 Certifications .........................................................6

2 Safety instructions and recommendations ..............................................7

2.1 Safety instructions ...............................................7

2.2 Recommendations ................................................8

3 Description ..................................................................................................9

3.1 Operating principle ...............................................9

3.1.1 Gas/air setting .........................................................9

3.1.2 Combustion .............................................................9

3.2 Main parts ............................................................10

3.3 Control panel .......................................................11

3.3.1 Description of the keys ..........................................11

3.3.2 Description of the display ......................................12

3.3.3 Browsing in the menus ..........................................15

4 Operating the boiler .................................................................................16

4.1 Commissioning the boiler ..................................16

4.2 Reading out measured values ...........................16

4.3 Changing the settings ........................................18

4.3.1 Setting the set point temperatures ........................18

4.3.2 Selecting the operating mode ...............................19

4.3.3 Forcing domestic hot water production .................20

4.3.4 Setting the contrast and lighting on the

display ...................................................................20

4.3.5 Setting the time and date ......................................21

4.3.6 Selecting a timer programme ................................21

4.3.7 Customising a timer programme ...........................22

1

15/06/12 - 300022163-001-01

4.4 Installation shutdown .........................................24

4.5 Frost protection ..................................................24

5 Checking and maintenance .....................................................................26

5.1 General instructions ...........................................26

5.2 Periodic checks ..................................................26

5.3 Filling the system ...............................................27

5.4 Bleeding the heating system .............................29

5.5 Draining the installation .....................................31

6 Troubleshooting .......................................................................................32

6.1 Anti-hunting ........................................................32

6.2 Messages (Code type Bxx or Mxx) ....................32

6.3 Faults (Code type Lxx or Dxx) ...........................34

7 Technical specifications ..........................................................................40

7.1 Technical specifications ....................................40

8 Energy savings .........................................................................................41

8.1 Energy-saving advice .........................................41

8.2 Recommendations ..............................................41

9 Warranty ....................................................................................................42

9.1 General ................................................................42

9.2 Warranty terms ...................................................42

Contents

2

15/06/12 - 300022163-001-01

3

15/06/12 - 300022163-001-01

1 Introduction

1.1 Symbols used

In these instructions, various danger levels are employed to draw the
user's attention to particular information. In so doing, we wish to
safeguard the user's safety, obviate hazards and guarantee correct
operation of the appliance.

DANGER

Risk of a dangerous situation causing serious physical
injury.

WARNING

Risk of a dangerous situation causing slight physical
injury.

CAUTION

Risk of material damage.

Signals important information.

¼ Signals a referral to other instructions or other pages in the
instructions.

1.2 Abbreviations

4 3CE: Collective conduit for sealed boiler

4 DHW: Domestic hot water

4 Hi: Lower heating value LHV (Nett)

4 Hs: Higher heating value HHV (Gross)

4 PPS: Polypropylene hardly inflammable

4 PCU: Primary Control Unit - PCB for managing burner operation

4 PSU: Parameter Storage Unit - Parameter storage for PCBs

PCU and SU

4 SCU: Secondary Control Unit - control panel PCB

4 SU: Safety Unit - Safety PCB

4 3WV: 3-way valve

MCA 35

1. Introduction

15/06/12 - 300022163-001-01

4

1.3 General

1.3.1. Manufacturer's liability

Our products are manufactured in compliance with the requirements
of the various applicable European Directives. They are therefore

delivered with [ marking and all relevant documentation.

In the interest of customers, we are continuously endeavouring to
make improvements in product quality. All the specifications stated in
this document are therefore subject to change without notice.

Our liability as the manufacturer may not be invoked in the following
cases:

4 Failure to abide by the instructions on using the appliance.

4 Faulty or insufficient maintenance of the appliance.

4 Failure to abide by the instructions on installing the appliance.

1.3.2. Installer's liability

The installer is responsible for the installation and inital start up of the
appliance. The installer must respect the following instructions:

4 Read and follow the instructions given in the manuals provided

with the appliance.

4 Carry out installation in compliance with the prevailing legislation

and standards.

4 Perform the initial start up and carry out any checks necessary.

4 Explain the installation to the user.

4 If a maintenance is necessary, warn the user of the obligation to

check the appliance and maintain it in good working order.

4 Give all the instruction manuals to the user.

1.3.3. User's liability

To guarantee optimum operation of the appliance, the user must
respect the following instructions:

4 Read and follow the instructions given in the manuals provided

with the appliance.

4 Call on qualified professionals to carry out installation and initial

start up.

4 Get your installer to explain your installation to you.

4 To carry out inspections and maintenance required by a qualified

professional.

4 Keep the instruction manuals in good condition close to the

appliance.

1. Introduction

MCA 35

5

15/06/12 - 300022163-001-01

This appliance is not intended to be used by persons (including
children) whose physcial, sensory or mental capacity is impaired or
persons with no experience or knowledge, unless they have the
benefit, through the intermediary of a person responsible for their
safety, of supervision or prior instructions regarding use of the
appliance. Care should be taken to ensure that children do not play
with the appliance.

1.4 Certifications

CE identification no

PIN 0063BT3444

NOx classification

5 (EN 297 pr A3, EN 656)

Type of connection

Chimney: B23

(1)

, B

23P

(1)

, B

33

Flue gas outlet: C

13(x)

, C

33(x)

, C

43(x)

, C53 ,

C

63(x)

, C

83(x)

, C

93(x)

(1) IP20

MCA 35 1. Introduction

15/06/12 - 300022163-001-01

6

2 Safety instructions and

recommendations

2.1 Safety instructions

DANGER

If you smell gas:

1. Do not use a naked flame, do not smoke, do not
operate electrical contacts or switches ( doorbell,
light, motor, lift, etc..).

2. Shut off the gas supply.

3. Open the windows.

4. Evacuate the premises.

5. Call your fitter.

DANGER

If you smell flue gases:

1. Switch the appliance off.

2. Open the windows.

3. Evacuate the premises.

4. Call your fitter.

WARNING

Depending on the settings of the appliance:

4 The temperature of the flue gas conduits may exceed

60°C.

4 The temperature of the radiators may reach 85°C.

4 The temperature of the domestic hot water may reach

65°C.

CAUTION

Do not neglect to service the appliance:
4 For completely safe and optimum operation, you

must have your boiler regularly serviced by an
approved installer.

2. Safety instructions and recommendations MCA 35

7

15/06/12 - 300022163-001-01

2.2 Recommendations

WARNING

Only qualified professionals are authorised to work on the
appliance and the installation.

4 Regularly check the water pressure in the installation (minimum

pressure 0,8 bar, recommended pressure between 1,5 and 2,0
bar).

4 Keep the appliance accessible at all times.

4 Never remove or cover labels and rating plates affixed to the

appliance. Labels and rating plates must be legible throughout the
entire lifetime of the appliance.

4 The appliance should be on Summer or Antrifreeze mode rather

than switched off to guarantee the following functions:

- Anti blocking of pumps

- Frost protection

MCA 35 2. Safety instructions and recommendations

15/06/12 - 300022163-001-01

8

3 Description

3.1 Operating principle

3.1.1. Gas/air setting

The casing fitted to the boiler is also used as an air box. Air is sucked
in by the fan and gas injected into the venturi by the fan intake. The
fan rotation speed is set according to the settings parameters, the
thermal energy requirement and the temperatures measured by the
temperature sensors. The gas and air are mixed in the venturi. The
gas/air ratio ensures that the quantities of gas and air are adjusted to
each other. This provides optimum combustion on the entire output
range. The gas/air mixture is fed into the burner on top of the
exchanger.

3.1.2. Combustion

The burner heats the heating water circulating in the heat
exchanger. At a return temperature lower than around 55°C, the flue
gases cool down to a temperature lower than the dew point, thus
causing the condensation of the water vapour contained in the flue
gases in the back side of the heat exchanger. The heat released
during this condensation process (the latent heat or condensing heat)
is also transferred to the heating water. The cooled combustion gases
are evacuated via the combustion gas outlet flue. The condensation
water is evacuated via a siphon.

3. Description MCA 35

9

15/06/12 - 300022163-001-01

3.2 Main parts

1

Flue gas discharge pipe

2

Casing/air box

3

Flue gas measuring point

4

Mixer pipe

5

Heating flow hose

6

Air intake silencer

7

Box for the control PCBs

8

Combined venturi and gas valve unit

9

Flow end hydroblock

10

Safety valve outlet pipe

11

Siphon

12

Control panel

13

Shunt pump

14

Return end hydroblock

15

3-way valve

16

Condensate receiver tank

17

Fan

18

Heat exchanger (Heating circuit)

19

Ignition/ionization electrode

20

Air intake

T001964-D

2

14

15

13

16

17

18

19

3

4

5

6

7

8

9

10

11

12

1 20

MCA 35 3. Description

15/06/12 - 300022163-001-01

10

3.3 Control panel

3.3.1. Description of the keys

A

Temperature setting key (heating, DHW, swimming pool)

B

Operating mode selection key

C

DHW override key

D

Key to access the parameters reserved for the installer

E

Keys on which the function varies as and when selections
are made

F

Rotary setting button:

4 Turn the rotary button to scroll through the menus or

modify a value

4 Press the rotary button to access the selected menu

or confirm a value modification

A000866-A

bar

STD

t

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

A

B

C

D

E

F

(

'

3. Description MCA 35

11

15/06/12 - 300022163-001-01

3.3.2. Description of the display

n

Key functions

>

Access to the various menus

(

Used to scroll through the menus

'

Used to scroll through the parameters

?

The symbol is displayed when help is available

f

Used to display the curve of the parameter selected

STD

Reset of the time programmes

b

Selection of comfort mode or selection of the days to be
programmed

v

Selection of reduced mode or deselection of the days to
be programmed

j

Back to the previous level

ESC

Back to the previous level without saving the
modifications made

t

Manual reset

n

Flame output level

C002705-A

The whole symbol flashes: The burner starts up but the
flame is not yet present

C002704-A

Part of the symbol flashes: Output is increasing

C002703-A

Steady symbol: The required output has been reached

C002702-A

Part of the symbol flashes: Output is dropping

bar

r

STD

(

'

t

0 2 4 6 8 10 12 14 16 18 22 2420

C002696-A

p

b

AUTO

x

c

r

j

L

g

m

bar

STD

t

0 2 4 6 8 10 12 14 16 18 22 2420

C002701-B

p

b

AUTO

x

c

r

j

M

g

m

MCA 35 3. Description

15/06/12 - 300022163-001-01

12

n

Solar (If connected)

u

The solar load pump is running

L000200-A

The top part of the tank is reheated to the tank set point

L000201-A

The entire tank is reheated to the tank set point

L000198-A

The entire tank is reheated to the solar tank set point

L000199-A

The tank is not loaded - Presence of the solar control
system

n

Operating modes

p

Summer mode: The heating is off. Domestic hot water
continues to be produced

b

WINTER mode: Heating and domestic hot water working

AUTO

Operation in automatic mode according to the timer
programme

x

Comfort mode: The symbol is displayed when a DAY
override (comfort) is activated

4 Flashing symbol: Temporary override

4 Steady symbol: Permanent override

m

Reduced mode: The symbol is displayed when a NIGHT
override (reduced) is activated

4 Flashing symbol: Temporary override

4 Steady symbol: Permanent override

g

Holiday mode: The symbol is displayed when a HOLIDAY
override (antifreeze) is activated

4 Flashing symbol: Holiday mode programmed

4 Steady symbol: Holiday mode active

m

Manual mode

bar

STD

t

0 2 4 6 8 10 12 14 16 18 22 2420

L000197-A

p

b

AUTO

x

c

r

j

M

g

m

bar

STD

t

0 2 4 6 8 10 12 14 16 18 22 2420

C002697-B

p

b

AUTO

x

c

r

j

M

g

m

bar

STD

t

0 2 4 6 8 10 12 14 16 18 22 2420

C002698-B

p

b

AUTO

x

c

r

j

M

g

m

3. Description MCA 35

13

15/06/12 - 300022163-001-01

n

System pressure

bar

Pressure indicator: The symbol is displayed when a water
pressure sensor is connected.

4 Flashing symbol: The water pressure is insufficient.

4 Steady symbol: The water pressure is sufficient.

l

Water pressure level

4 R : 0,9 to 1,1 bar
4 E : 1,2 to 1,5 bar
4 Z : 1,6 to 1,9 bar
4 A : 2,0 to 2,3 bar
4 l : > 2,4 bar

n

Domestic Hot Water override

A bar is displayed when a DHW override is activated:

4 Flashing bar: Temporary override

4 Steady bar: Permanent override

n

Other information

r

The symbol is displayed when domestic hot water
production is running.

w

Valve indicator: The symbol is displayed when a 3-way
valve is connected.

4 x : 3-way valve opens
4 c : 3-way valve closes

M

The symbol is displayed when the pump is operating.

Name of the circuit for which the parameters are
displayed.

bar

STD

t

0 2 4 6 8 10 12 14 16 18 22 2420

C002708-A

p

b

AUTO

x

c

r

j

M

g

m

bar

STD

t

0 2 4 6 8 10 12 14 16 18 22 2420

C002707-A

p

b

AUTO

x

c

r

j

M

g

m

bar

STD

t

0 2 4 6 8 10 12 14 16 18 22 2420

C002699-B

p

b

AUTO

x

c

r

j

M

g

m

MCA 35 3. Description

15/06/12 - 300022163-001-01

14

3.3.3. Browsing in the menus

1. To select the desired menu, turn the rotary button.

2. To access the menu, press the rotary button.
To go back to the previous display, press the key j.

3. To select the desired parameter, turn the rotary button.

4. To modify the parameter, press the rotary button.
To go back to the previous display, press the key j.

5. To modify the parameter, turn the rotary button.

6. To confirm, press the rotary button.

To cancel, press key

h

.

7. To go back to the main display, press key j2 times.

It is possible to use the ( and ' keys instead of the rotary
button.

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

L

g

m

#MEASURES

#CHOICE TIME PROG.

#TIME PROGRAM
#SETTING
#TIME .DAY

a

C002220-B-04

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

L

g

m

CURRENT PROG.B

CURRENT PROG.C

P2

P3

a

C002221-C-04

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

L

g

m

CURRENT PROG.C

"Choice of the timeprogram
applied C"

P4

a

C002222-C-04

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

LUNDI 11:45

C002224-D-04

2x

3. Description MCA 35

15

15/06/12 - 300022163-001-01

4 Operating the boiler

4.1 Commissioning the boiler

1. Check the water pressure in the installation shown on the control
panel display.

If the water pressure is lower than 0,8 bar, more water
should be added. If necessary, top up the water level in the
heating system (recommended hydraulic pressure
between 1,5 and 2,0 bar).

¼

See chapter: "Filling the system", page 27

2. Open the gas valve on the boiler.

3. Turn on the boiler using the on/off switch.

4. The first time the boiler is powered up, the #LANGUAGE menu is
displayed. Select the desired language by turning the rotary
button.

5. To confirm, press the rotary button.
The boiler will begin an automatic venting-programme (which lasts
approx. 3 minutes) and will do this every time the power supply is
isolated. If there is a problem, the error is displayed on the screen.

4.2 Reading out measured values

The various values measured by the appliance are displayed in the
#MEASURES menu.

1. To access user level: Press the > key.

2. Select the menu #MEASURES.

4

Turn the rotary button to scroll through the menus or
modify a value.

4 Press the rotary button to access the selected menu

or confirm a value modification.

¼

For a detailed explanation of menu browsing, refer

to the chapter: "Browsing in the menus", page 15.

C002366-B

Français - Deutsch - English ­Italiano - Espanol - Nederlands

- Pycck - Polski - Türk -

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

x

c

r

g

m

ÿ

LANGUE FRANCAIS

C002286-C

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

SUNDAY 11:45

C002219-D-04

MCA 35 4. Operating the boiler

15/06/12 - 300022163-001-01

16

User level - Menu #MEASURES

Parameter Description Unit

OUTSIDE TEMP.

Outside temperature °C

ROOMTEMP. A

(1)

Room temperature of circuit A °C

ROOMTEMP. B

(1)

Room temperature of circuit B °C

ROOMTEMP. C

(1)

Room temperature of circuit C °C

BOILER TEMP.

Water temperature in the boiler °C

PRESSURE

Water pressure in the installation bar

WATER TEMP.

(1)

Water temperature in the DHW tank °C

INST DWH TEMP.

(1)

Instant hot water temperature °C

STOR.TANK.TEMP

(1)

Water temperature in the storage tank °C

DCW TEMPERATURE

Domestic cold water temperature °C

SWIMMING P.T.B

(1)

Water temperature of the swimming pool on circuit B °C

SWIMMING P.T.C

(1)

Water temperature of the swimming pool on circuit C °C

OUTLET TEMP. B

(1)

Temperature of the flow water in circuit B °C

OUTLET TEMP. C

(1)

Temperature of the flow water in circuit C °C

SYSTEM TEMP.

(1)

Temperature of the system flow water if multi-generator °C

T.DHW BOTTOM

(1)

Water temperature in the bottom of the DHW tank °C

TEMP.TANK AUX

(1)

Water temperature in the second DHW tank connected to the AUX circuit °C

DHW A TEMP.

(1)

Water temperature in the second DHW tank connected to circuit A °C

BACK TEMP Temperature of the boiler return water °C

WIND SPEED Fan rotation speed rpm

POWER Instantaneous boiler output (0%: Burner off or running at minimum output) %

CURRENT (µA) Ionization current µA

NB IMPULS. Number of burner starts (not restartable)

The meter is incremented by 8 every 8 start-ups

RUNTIME Number of burner operation hours (not restartable)

The meter is incremented by 2 every 2 hours

h

IN 0-10V

(1)

Voltage at input 0-10 V V

SEQUENCE

Control system sequence

CTRL Software control number

(1) The parameter is only displayed for the options, circuits or sensors actually connected.

4. Operating the boiler MCA 35

17

15/06/12 - 300022163-001-01

4.3 Changing the settings

4.3.1. Setting the set point temperatures

To set the various heating, DHW and swimming pool temperatures,
proceed as follows:

1. Press the C key.

2. To select the desired parameter, turn the rotary button.

3. To modify the parameter, press the rotary button.
To go back to the previous display, press the key j.

4. To modify the parameter, turn the rotary button.

5. To confirm, press the rotary button.

To cancel, press key

h

.

Menu C

Parameter Adjustment range Description Factory setting

DAY TEMP. A

5 to 30 °C Desired room temperature in comfort periods on circuit A 20 °C

NIGHT TEMP. A

5 to 30 °C Desired room temperature in reduced periods on circuit A 16 °C

DAY TEMP. B

(1)

5 to 30 °C Desired room temperature in comfort periods on circuit B 20 °C

NIGHT TEMP. B

(1)

5 to 30 °C Desired room temperature in reduced periods on circuit B 16 °C

DAY TEMP. C

(1)

5 to 30 °C Desired room temperature in comfort periods on circuit C 20 °C

NIGHT TEMP. C

(1)

5 to 30 °C Desired room temperature in reduced periods on circuit C 16 °C

WATER TEMP.

(1)

10 to 80 °C Desired domestic hot water temperature in the DHW circuit 55 °C

WATER T.NIGHT

(1)

(2)

10 to 80 °C Set tank temperature, night programme 10 °C

TEMP.TANK AUX

(1)

10 to 80 °C Desired domestic hot water temperature in the auxiliary circuit 55 °C

AUX.TANK
T.NIGHT

(1)(2)

10 to 80 °C Set tank temperature, night programme 10 °C

DHW A TEMP.

(1)

10 to 80 °C Desired domestic hot water temperature in circuit A 55 °C

A.TANK T.NIGHT

(1)

(2)

10 to 80 °C Set tank temperature, night programme 10 °C

SWIMMING P.T.B

(1)

5 to 39 °C Desired temperature for swimming pool B 20 °C

SWIMMING P.T.C

(1)

5 to 39 °C Desired temperature for swimming pool C 20 °C

(1) The parameter is only displayed for the options, circuits or sensors actually connected.
(2) The parameter is only displayed if INSTALLATION parameter is set to EXTENDED

MODE

C002266-A

MCA 35 4. Operating the boiler

15/06/12 - 300022163-001-01

18

4.3.2. Selecting the operating mode

To select an operating mode, proceed as follows:

1. Press the MODE key.

2. To select the desired parameter, turn the rotary button.

3. To modify the parameter, press the rotary button.
To go back to the previous display, press the key j.

4. To modify the parameter, turn the rotary button.

5. To confirm, press the rotary button.

To cancel, press key h.

Menu MODE

Parameter Adjustment range Description Factory setting

AUTOMATIQUE

The comfort ranges are determined by the timer programme.

DAY

7/7, xx:xx Comfort mode is forced until the time indicated or all the time (7/7). Present time + 1

hour

NIGHT

7/7, xx:xx Reduced mode is forced until the time indicated or all the time

(7/7).

Present time + 1
hour

HOLIDAYS

7/7, 1 to 365 The antifreeze mode is active on all boiler circuits.

Number of days' holiday: xx

(1)

heating OFF: xx:xx

(1)

Restarting: xx:xx

(1)

Present date + 1
day

SUMMER

The heating is off.
Domestic hot water continues to be produced.

MANUEL

The generator operates according to the set point setting. All of
the pumps operate. Option of setting the set point by simply
turning the rotary button.

FORCE AUTO

(2)

YES / NO An operating mode override is activated on the remote control

(option).
To force all circuits to run on AUTOMATIQUE mode, select

YES.

(1) The start and end days and the number of days are calculated in relation to each other.
(2) The parameter is only displayed if a room sensor is connected.

MODE

C002267-A

4. Operating the boiler MCA 35

19

15/06/12 - 300022163-001-01

4.3.3. Forcing domestic hot water production

To force domestic hot water production, proceed as follows:

1. Press the r key.

2. To select the desired parameter, turn the rotary button.

3. To modify the parameter, press the rotary button.
To go back to the previous display, press the key j.

4. To modify the parameter, turn the rotary button.

5. To confirm, press the rotary button.

To cancel, press key h.

Menu r

Parameter Description Factory setting

AUTOMATIQUE

The domestic hot water comfort ranges are determined by the timer programme.

COMFORT

Domestic hot water comfort mode is forced until the time indicated or all the time (7/7). Present time + 1 hour

4.3.4. Setting the contrast and lighting on the

display

1. To access user level: Press the > key.

2. Select the menu #SETTING.

4

Turn the rotary button to scroll through the menus or
modify a value.

4 Press the rotary button to access the selected menu

or confirm a value modification.

¼

For a detailed explanation of menu browsing, refer

to the chapter: "Browsing in the menus", page 15.

3. Set the following parameters:

User level - Menu #SETTING

Parameter Adjustment range Description Factory setting Customer setting

CONTRAST DISP.

Adjusting the display contrast.

BACK LIGHT COMFORT

The screen is illuminated continuously in
daytime periods.

ECO

ECO

The screen is illuminated for 2 minutes
whenever pressed.

MODE

C002268-A

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

SUNDAY 11:45

C002219-D-04

MCA 35 4. Operating the boiler

15/06/12 - 300022163-001-01

20

4.3.5. Setting the time and date

1. To access user level: Press the > key.

2. Select the menu #TIME .DAY.

4 Turn the rotary button to scroll through the menus or

modify a value.

4 Press the rotary button to access the selected menu

or confirm a value modification.

¼

For a detailed explanation of menu browsing, refer

to the chapter: "Browsing in the menus", page 15.

3. Set the following parameters:

User level - Menu #TIME .DAY

(1)

Parameter Adjustment range Description Factory setting Customer setting

HOURS

0 to 23 Hours setting

MINUTE

0 to 59 Minutes setting

DAY

Monday to Sunday Setting the day of the week

DATE

1 to 31 Day setting

MONTH

January to December Month setting

YEAR

2008 to 2099 Year setting

SUM. TIME: AUTO

automatic switch to summer time on the last Sunday
in March and back to winter time on the last Sunday
in October.

AUTO

MANU

for countries where the time change is done on
other dates or is not in use.

(1) According to the configuration

4.3.6. Selecting a timer programme

1. To access user level: Press the > key.

2. Select the menu #CHOICE TIME PROG..

4

Turn the rotary button to scroll through the menus or
modify a value.

4 Press the rotary button to access the selected menu

or confirm a value modification.

¼

For a detailed explanation of menu browsing, refer

to the chapter: "Browsing in the menus", page 15.

3. To select the desired parameter.

4. Assign the desired timer programme (P1 to P4) to the circuit with
the rotary button.

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

SUNDAY 11:45

C002219-D-04

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

SUNDAY 11:45

C002219-D-04

4. Operating the boiler

MCA 35

21

15/06/12 - 300022163-001-01

User level - Menu #CHOICE TIME PROG.

Parameter Adjustment range Description

CURRENT PROG.A

P1 / P2 / P3 / P4 Comfort programme activated

(Circuit A)

CURRENT PROG.B

P1 / P2 / P3 / P4 Comfort programme activated

(Circuit B)

CURRENT PROG.C

P1 / P2 / P3 / P4 Comfort programme activated

(Circuit C)

4.3.7. Customising a timer programme

1. To access user level: Press the > key.

2. Select the menu #TIME PROGRAM.

4 Turn the rotary button to scroll through the menus or

modify a value.

4 Press the rotary button to access the selected menu

or confirm a value modification.

¼

For a detailed explanation of menu browsing, refer

to the chapter: "Browsing in the menus", page 15.

3. To select the desired parameter.

User level - Menu #TIME PROGRAM

Parameter Time schedule Description

TIME PROG.A PROG P2 A

PROG P3 A
PROG P4 A

Timer programme for circuit A

TIME PROG.B PROG P2 B

PROG P3 B
PROG P4 B

Timer programme for circuit B

TIME PROG.C PROG P2 C

PROG P3 C
PROG P4 C

Timer programme for circuit C

TIME PROG.DHW

DHW circuit timer programme

TIME PROG.AUX

Auxiliary circuit timer programme

4. To select a timer programme to be modified.

5.

To select to days for which the timer programme is to be
modified:

Turn the rotary button to the left until you reach the day desired.
To confirm, press the rotary button.

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

SUNDAY 11:45

C002219-D-04

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

L

g

m

PROG P2 C
Mo Tu We Th Fr Sa Su
"Display of the timeprogram.
To continuepush on the button"

a

C002228-B-04

MCA 35

4. Operating the boiler

15/06/12 - 300022163-001-01

22

6.b : Day selection
Press key b / v until the symbol b is displayed.
Turn the rotary button to the right to select the day(s) desired.

v

: Cancelling the day selection
Press key b / v until the symbol v is displayed.
Turn the rotary button to the right to cancel selection of the relevant

day(s).

7. When the days desired for the programme have been selected,
press the rotary button to confirm.

8.

To define the timer ranges for the comfort mode and reduced
mode:

Turn the rotary button to the left until 0:00 is displayed. The first
segment of the graphic bar for the timer programme flashes.

9.b : Comfort mode selection
Press key b / v until the symbol b is displayed.
To select a comfort time range, turn the rotary button to the right.

v

: Reduced mode selection
Press key b / v until the symbol v is displayed.
To select a reduced time range, turn the rotary button to the right.

10.When the times for the comfort mode have been selected, press
the rotary button to confirm.

User level - Menu #TIME PROGRAM

Day Comfort periods / Filling enabled:

P1
_______________

P2 _______________ P3 _______________ P4 _______________

TIME PROG.A

Monday 6:00 to 22:00

Tuesday 6:00 to 22:00

Wednesday 6:00 to 22:00

Thursday 6:00 to 22:00

Friday 6:00 to 22:00

Saturday 6:00 to 22:00

Sunday 6:00 to 22:00

TIME PROG.B

Monday 6:00 to 22:00

Tuesday 6:00 to 22:00

Wednesday 6:00 to 22:00

Thursday 6:00 to 22:00

Friday 6:00 to 22:00

Saturday 6:00 to 22:00

Sunday 6:00 to 22:00

TIME PROG.C

Monday 6:00 to 22:00

Tuesday 6:00 to 22:00

Wednesday 6:00 to 22:00

Thursday 6:00 to 22:00

Friday 6:00 to 22:00

Saturday 6:00 to 22:00

Sunday 6:00 to 22:00

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

L

g

m

PROG P2 C
Mo Tu

We Th Fr Sa Su

"Select the days to
program"

a

C002229-C-04

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

L

g

m

PROG P2 C
Mo Tu

We Th Fr Sa Su

Set the time program.

a

C002230-E-04

06:00

06:00

4. Operating the boiler MCA 35

23

15/06/12 - 300022163-001-01

User level - Menu #TIME PROGRAM

Day Comfort periods / Filling enabled:

P1
_______________

P2 _______________ P3 _______________ P4 _______________

TIME PROG.DHW

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

TIME PROG.AUX

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

4.4 Installation shutdown

CAUTION

Do not switch off the mains supply to the appliance. If the
central heating system is not used for a long period, we
recommend activating the HOLIDAYS mode (to ensure
the anti-grip of the heating pump).

4.5 Frost protection

When the heating water temperature in the boiler falls by too much,
the integrated protection system in the boiler starts up. This protection
functions as follows:

4 If the water temperature is lower than 7°C, the heating pump starts

up.

4 If the water temperature is lower than 4°C, the boiler starts up.

4 If the water temperature is higher than 10°C, the boiler shuts down

and the circulation pump continues to run for a short time.

MCA 35

4. Operating the boiler

15/06/12 - 300022163-001-01

24

CAUTION

4 The antifreeze protection does not function if the

appliance is switched off.

4 The integrated protection system only protects the

boiler, not the installation. To protect the installation,
set the appliance to HOLIDAYS mode.

The HOLIDAYS mode protects:

4 The installation if the outside temperature is lower than 3°C

(factory setting).

4 The room temperature if a remote control is connected and the

room temperature is lower than 6 °C (factory setting).

4 The domestic hot water tank if the tank temperature is lower

than 4 °C (the water is reheated to 10 °C).

To configure the holidays mode: ¼ See chapter: "Selecting the
operating mode", page 19.

4. Operating the boiler MCA 35

25

15/06/12 - 300022163-001-01

5 Checking and maintenance

5.1 General instructions

The boiler does not require a lot of maintenance. Nevertheless, we
recommend having the boiler inspected and serviced at regular
intervals.

4 Maintenance and cleaning of the boiler must be carried out at least

once a year by a qualified technician.

4 Have the flues swept at least once a year or more, depending on

the regulations in force in your country.

CAUTION

4 Maintenance operations must be done by a qualified

engineer.

4 We recommend taking out a maintenance contract.

4 Only original spare parts must be used.

4 Make certain that the flues and chimneys are

connected, in good condition and not blocked.

4 Do not modify nor block the condensate outlet(s).

4 If a neutralisation system is installed, follow the

instructions delivered with the neutralisation system
for cleaning and servicing of this system.

The boiler displays a message whenever maintenance is necessary.

1. When the message, REVISION, is displayed, press ? to display
the installer's telephone number (only if the installer has input this
parameter).

2. Contact the fitter.

3. To carry out inspections and maintenance required by a qualified
professional.

5.2 Periodic checks

4 Check the water pressure in the installation.

If the water pressure is lower than 0,8 bar, more water
should be added. If necessary, top up the water level in the
heating system (recommended hydraulic pressure
between 1,5 and 2,0 bar).

¼ See chapter: "Filling the system", page 27.

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

SUNDAY 11:45

TEMP. : 68°

PCU COM.FAIL D27

C002302-D-04

MCA 35 5. Checking and maintenance

15/06/12 - 300022163-001-01

26

4 Carry out a visual check for the presence of any water leaks.

4 Open and close the radiator valves several times a year (this

prevents the valves from seizing up).

4 Clean the outside of the boiler using a damp cloth and a light

detergent.

CAUTION

Only a qualified professional is authorised to clean the
inside of the boiler.

5.3 Filling the system

1. Check the water pressure in the installation shown on the control
panel display.

If the water pressure is lower than 0,8 bar, more water
should be added. If necessary, top up the water level in the
heating system (recommended hydraulic pressure
between 1,5 and 2,0 bar).

2. Open the valves on all radiators connected to the heating system.

3. Set the heating set point to as low a temperature as possible.

4. Wait until the temperature drops below 40°C and the radiators
seem cold before filling the central heating system.

T001507-B

1

2

3

4

T000181-B

1

2

3

4

T000181-B

T000185-A

5. Checking and maintenance MCA 35

27

15/06/12 - 300022163-001-01

5. Open the cold water inlet and heating outlet valves.

6. Open the disconnector valves.

7. Close the disconnector valves when the manometer indicates a
pressure of 2 bar.

When water is added, air gets into the heating system.
Degas the installation. After the air has been vented, the
water pressure can drop below the required level. Check
the water pressure in the heating system. If the water
pressure is lower than 0,8 bar, more water should be
added.

8. After filling the installation, switch the boiler on.

Filling and bleeding the installation 2 times a year should
be sufficient to obtain an adequate hydraulic pressure. If it
is often necessary to top up the installation with water,
contact your fitter.

T001620-A

T001618-A

1

2

T001619-A

2

1

2 bar

MCA 35 5. Checking and maintenance

15/06/12 - 300022163-001-01

28

5.4 Bleeding the heating system

It is essential that you bleed any air in the calorifier, the conduits or
the taps to prevent the annoying noises likely to be produced during
heating or when tapping water. To do this, proceed as follows:

1. Open the valves on all radiators connected to the heating system.

2. Set the heating set point to as high a temperature as possible.

3. Wait until the radiators are hot.

4. Switch the boiler off.

5. Wait around 10 minutes until the radiators are cold.

6. Bleed the radiators. Start with the lower floors.

1

2

3

4

T000181-B

T000184-A

T000185-A

T000854-A

3

1

4

5

2

5. Checking and maintenance MCA 35

29

15/06/12 - 300022163-001-01

7. Open the bleed connection using the bleed key provided whilst
keeping a rag pressed against the connection.

8. Wait until water comes out of the bleed valve and then close the
bleed connection.

CAUTION

The water may still be hot.

9. Switch on the boiler. A vent cycle of a duration of around 3 minutes
is carried out automatically.

10.After venting, check whether the pressure in the installation is still
sufficient.

If the water pressure is lower than 0,8 bar, more water
should be added. If necessary, top up the water level in the
heating system (recommended hydraulic pressure
between 1,5 and 2,0 bar).

¼

See chapter: "Filling the system", page 27

11.Set the heating set point.

T000217-A

T000218-A

MCA 35 5. Checking and maintenance

15/06/12 - 300022163-001-01

30

5.5 Draining the installation

It may become necessary to empty the water from the heating system
when the radiators have to be replaced, should there be a major water
leak or a risk of frost. To do this, proceed as follows:

1. Open the valves on all radiators connected to the heating system.

2. Switch off the boiler electrical power supply.

3. Wait around 10 minutes until the radiators are cold.

4. Connect an evacuation hose to the plug located at the lowest
level. Place the end of the hose in a discharge sump or in a place
where the water discharged from the valve can not do any
damage.

5. Open the filling/draw-off valve on the heating system. Vent the
heating installation.

WARNING

The water may still be hot.

6. When no more water comes out of the drainage plug, close the
drainage valve.

1

2

3

4

T000181-B

T000185-A

T000858-A

5. Checking and maintenance MCA 35

31

15/06/12 - 300022163-001-01

6 Troubleshooting

6.1 Anti-hunting

When the boiler is in Anti-short-cycle operating mode, the symbol ?
flashes.

1. Press the "?" key.
The message Operation assured when the restart temperature
will be reached is displayed.

This message is not an error message but an item of
information.

6.2 Messages (Code type Bxx or Mxx)

In the case of failure, the control panel displays a message and a
corresponding code.

1. Make a note of the code displayed.
The code is important for the correct and rapid diagnosis of the
type of failure and for any technical assistance that may be
needed.

2. Switch the boiler off and switch back on.
The boiler starts up again automatically when the reason for the
blocking has been removed.

3. If the code is displayed again, correct the problem by following the
instructions in the table below:

Code

Messages Description Checking / solution

B00 BL.CRC.PSU

The PSU PCB is incorrectly
configured

Parameter error on the PSU PCB

4 Contact the professional who takes care of

maintenance of the appliance

B01 BL.MAX BOILER

Maximum flow temperature
exceeded

The water flow in the installation is insufficient

4 Check the circulation (direction, pump, valves)

B02 BL.HEATING SPEED

The increase in flow temperature
has exceeded its maximum limit

The water flow in the installation is insufficient

4 Check the circulation (direction, pump, valves)

4 Check the water pressure

Sensor error

4 Contact the professional who takes care of

maintenance of the appliance

B07 BL.DT OUTL RET.

Maximum difference between
the flow and return temperature
exceeded

The water flow in the installation is insufficient

4 Check the circulation (direction, pump, valves)

4 Check the water pressure

Sensor error

4 Contact the professional who takes care of

maintenance of the appliance

MCA 35 6. Troubleshooting

15/06/12 - 300022163-001-01

32

Code Messages Description Checking / solution

B08 BL.RL OPEN

The RL inlet on the PCU PCB
terminal block is open

Parameter error

4 Contact the professional who takes care of

maintenance of the appliance

Bad connection

4 Contact the professional who takes care of

maintenance of the appliance

B09 BL.INV. L/N

4 Contact the professional who takes care of maintenance of the appliance

B10
B11

BL.BL INPUT OPEN

The BL inlet on the PCU PCB
terminal block is open

The contact connected to the BL inlet is open

4 Contact the professional who takes care of

maintenance of the appliance

Parameter error

4 Contact the professional who takes care of

maintenance of the appliance

Bad connection

4 Contact the professional who takes care of

maintenance of the appliance

B13 BL. PCU COM

BL.COM PCU-D4

Communication error with the
SCU PCB

Bad connection

4 Contact the professional who takes care of

maintenance of the appliance

SCU PCB not installed in the boiler

4 Contact the professional who takes care of

maintenance of the appliance

B14 BL.WATER MIS.

The water pressure is lower than
0,8 bar

Not enough water in the circuit

4 Top up the installation with water

B15 BL.GAS PRESS

Gas pressure too low Incorrect setting of the gas pressure switch on the SCU PCB

4 Check that the gas valve is fully opened

4 Contact the professional who takes care of

maintenance of the appliance

B16

BL.BAD SU

The SU PCB is not recognised Wrong SU PCB for this boiler

4 Contact the professional who takes care of

maintenance of the appliance

B17 BL.PCU ERROR

The parameters saved on the
PCU PCB are impaired

Parameter error on the PCU PCB

4 Contact the professional who takes care of

maintenance of the appliance

B18 BL.BAD PSU

The PSU PCB is not recognised Wrong PSU PCB for this boiler

4 Contact the professional who takes care of

maintenance of the appliance

B19 BL.NO CONFIG

The boiler has not been
configured

The PSU PCB has been changed

4 Contact the professional who takes care of

maintenance of the appliance

B21 BL. COM SU

Communication error between
the PCU and SU PCBs

Bad connection

4 Contact the professional who takes care of

maintenance of the appliance

B22 BL.FLAME LOS

No flame during operation No ionization current

4 Check that the gas valve is fully opened

4 Contact the professional who takes care of

maintenance of the appliance

B25

BL.SU ERROR

Internal error on the SU PCB

4 Contact the professional who takes care of

maintenance of the appliance

B26 BL.DHW. S.

The DHW tank sensor is
disconnected or short circuited

4 Contact the professional who takes care of

maintenance of the appliance

6. Troubleshooting MCA 35

33

15/06/12 - 300022163-001-01

Code Messages Description Checking / solution

B27 BL.DHW INST

The sensor on the plate
exchanger outlet is disconnected
or short circuited

4 Contact the professional who takes care of

maintenance of the appliance

M04 REVISION

A service is required The date programmed for the service has been reached

4 If the symbol ? flashes, press key ?. The installer's

contact details are displayed.

4 Contact the professional who takes care of

maintenance of the appliance

M05 REVISION A

An A, B or C service is required The date programmed for the service has been reached

4 If the symbol ? flashes, press key ?. The installer's

contact details are displayed.

4 Contact the professional who takes care of

maintenance of the appliance

M06

REVISION B

M07 REVISION C

M20 DISGAS

A boiler vent cycle is underway Switching the boiler on

4 Wait 3 minutes

FL.DRY.B XX DAYS

Floor drying is active
XX DAYS = Number of days'

floor drying remaining.

Floor drying is underway. Heating on the circuits not
concerned is shut down.

4 Contact the professional who takes care of

maintenance of the appliance

FL.DRY.C XX DAYS

FL.DRY.B+C XX DAYS

M23 CHANGE OUTSI.S

The outside temperature sensor
is defective.

Change the outside radio temperature sensor.

M30 BL.COM.MODBUS

No communication with the
master regulation by the network
MODBUS.

Contact the professional who takes care of maintenance of
the appliance.

M31 BL.SYSTEM NETWORK

Incorrect configuration of the
network MODBUS.

Contact the professional who takes care of maintenance of
the appliance.

STOP N XX

The shutdown is active
XX = Number of the active
shutdown

A shutdown is underway. The circuits selected for this stop
are in Antifreeze mode during the period chosen.

6.3 Faults (Code type Lxx or Dxx)

In the event of operational failure, the control panel flashes and
displays an error message and a corresponding code.

1. Make a note of the code displayed.
The code is important for the correct and rapid diagnosis of the
type of failure and for any technical assistance that may be
needed.

2. Press the t key. If the code is displayed again, switch off the boiler
and then switch it back on.

bar

1

1

2

2

r

c

STD

(

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

SUNDAY 11:45

TEMP. : 68°

PCU. COM. FAIL. D27

C002604-B-04

MCA 35

6. Troubleshooting

15/06/12 - 300022163-001-01

34

3. Press the ? key. Follow the instructions displayed to solve the
problem.

4. Consult the meaning of the codes in the table below:

Code Faults Cause

of the
fault

Description Checking / solution

L00 PSU FAIL

PCU PSU PCB not connected Bad connection

PSU PCB faulty

4 Contact the professional who takes care of

maintenance of the appliance

L01 PSU PARAM FAIL

PCU The safety parameters are incorrect Bad connection

PSU PCB faulty

4 Contact the professional who takes care of

maintenance of the appliance

L02 DEF.OUTLET S.

PCU The boiler flow sensor has short-

circuited

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

L03 DEF.OUTLET S.

PCU The boiler flow sensor is on an open

circuit

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

L04 DEF.OUTLET S.

PCU Boiler temp too low Bad connection

Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

No water circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

L05 STB OUTLET

PCU Boiler temperature too high Bad connection

Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

No water circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

L06 BACK S.FAILURE

PCU The return temperature sensor has

short-circuited

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

bar

1

1

2

2

r

c

STD

(

'

t

v

0 2 4 6 8 10 12 14 16 18 22 2420

p

b

AUTO

x

c

r

j

M

g

m

SUNDAY 11:45

TEMP. : 68°

PCU COM.FAIL D27

C002302-D-04

6. Troubleshooting MCA 35

35

15/06/12 - 300022163-001-01

Code Faults Cause

of the
fault

Description Checking / solution

L07 BACK S.FAILURE

PCU The return temperature sensor is on

an open circuit

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

L08 BACK S.FAILURE

PCU Return temperature too low Bad connection

Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

No water circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

L09 STB BACK

PCU Return temperature too high Bad connection

Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

No water circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

L10 DEP-RET>MAX

PCU Difference between the flow and

return temperatures insufficient

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

No water circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

L11 RET-DEP>MAX

PCU Difference between the flow and

return temperatures too great

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

No water circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

L12 STB OPEN

PCU Maximum boiler temperature

exceeded (STB thermostat
maximum)

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

No water circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

MCA 35 6. Troubleshooting

15/06/12 - 300022163-001-01

36

Code Faults Cause

of the
fault

Description Checking / solution

L14 BURNER FAILURE

PCU 5 burner start-up failures No ignition

4 Contact the professional who takes care of

maintenance of the appliance

Ignition arc, but no flame formation

4 Check that the gas valve is fully opened

4 Contact the professional who takes care of

maintenance of the appliance
Presence of the flame but insufficient ionization
(<3 µA)

4 Check that the gas valve is fully opened

4 Contact the professional who takes care of

maintenance of the appliance

L16

PARASIT FLAME

PCU Detection of a parasite flame Ionization current present when there should not

be a flame
Ignition transformer defective
Gas valve defective
The burner remains very hot: CO2 too high

4 Contact the professional who takes care of

maintenance of the appliance

L17 VALVE FAIL

PCU Problem on the SU PCB Bad connection

SU PCB faulty

4 Contact the professional who takes care of

maintenance of the appliance

L34 FAN FAILURE

PCU The fan is not running at the right

speed

Bad connection
Fan defective

4 Contact the professional who takes care of

maintenance of the appliance

L35 BACK>BOIL FAIL

PCU Flow and return reversed Bad connection

Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance
Water circulation direction reversed

4 Check the circulation (direction, pump,

valves)

L36 I-CURRENT FAIL

PCU The flame went out more than 5

times in 24 hours while the burner
was operating

No ionization current

4 Check that the gas valve is fully opened

4 Contact the professional who takes care of

maintenance of the appliance

L37

SU COM.FAIL

PCU Communication failure with the SU

PCB

Bad connection

4 Contact the professional who takes care of

maintenance of the appliance

L38 PCU COM.FAIL

PCU Communication failure between the

PCU and SCU PCBs

Bad connection
SCU PCB not connected or faulty

4 Contact the professional who takes care of

maintenance of the appliance

L39 BL OPEN FAIL

PCU The BL inlet opened for a short time Bad connection

External cause
Parameter incorrectly set

4 Contact the professional who takes care of

maintenance of the appliance

6. Troubleshooting MCA 35

37

15/06/12 - 300022163-001-01

Code Faults Cause

of the
fault

Description Checking / solution

L40 TEST.HRU.FAIL

PCU HRU/URC unit test error Bad connection

External cause
Parameter incorrectly set

4 Contact the professional who takes care of

maintenance of the appliance

L250 DEF.WATER MIS.

PCU The water pressure is too low Hydraulic circuit incorrectly vented

Water leak
Measurement error

4 Top up with more water if necessary

4 Reset the boiler

L251

MANOMETRE FAIL

PCU Fault on the water pressure sensor Wiring problem

The manometer is defective
Sensor pcb defective

4 Contact the professional who takes care of

maintenance of the appliance

D03
D04

OUTL S.B FAIL.
OUTL S.C FAIL.

SCU Circuit B flow sensor fault

Circuit C flow sensor fault
Remarks:

The circuit pump is running.
The 3-way valve motor on the circuit
is no longer powered and can be
adjusted manually.

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

D05 OUTSI.S.FAIL.

SCU Outside temperature sensor fault

Remarks:
The boiler operates on BOILER
MAX temperature.
The valve setting is no longer
ensured but monitoring the
maximum temperature of the circuit
after the valve is ensured.
Valves may be manually operated.
Reheating the domestic hot water
remains ensured.

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

D07 SYST.SENS.FAIL.

SCU System sensor fault Bad connection

Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

D09 DHW S.FAILURE

SCU Domestic hot water sensor fault

Remarks:
Heating of domestic hot water is no
longer ensured.
The load pump operates.
The load temperature of the dhw
tank is the same as the boiler.

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

D11
D12
D13

ROOM S.A FAIL.
ROOM S.B FAIL.
ROOM S.C FAIL.

SCU A room temperature sensor fault

B room temperature sensor fault
C room temperature sensor fault

Note:
The circuit concerned operates
without any influence from the room
sensor.

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

D14 MC COM.FAIL

SCU Communication failure between the

SCU PCB and the boiler radio
module

Bad connection

4 Check the link and the connectors

Boiler module failure

4 Change the boiler module

MCA 35 6. Troubleshooting

15/06/12 - 300022163-001-01

38

Code Faults Cause

of the
fault

Description Checking / solution

D15 ST.TANK S.FAIL

SCU Storage tank sensor fault

Note:
The hot water storage tank reheating
operation is no longer assured.

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

D16
D16

SWIM.P.B. S.FAIL
SWIM.P.C. S.FAIL

SCU Swimming pool sensor fault circuit B

Swimming pool sensor fault circuit C
Note:

Swimming pool reheating is always
done during the circuit's comfort
period.

Bad connection
Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

D17 DHW 2 S.FAIL

SCU Sensor fault tank 2 Bad connection

Sensor fault

4 Contact the professional who takes care of

maintenance of the appliance

D27 PCU COM. FAIL

SCU Communication failure between the SCU and PCU PCBs

4 Contact the professional who takes care of maintenance of the appliance

D32 5 RESET:ON/OFF

SCU 5 resets done in less than an hour

4 Switch the boiler off and switch back on

4 If the boiler does not start after several resets (5 attempts possible), contact your

heating engineer and inform him of the error message displayed

D37

TA-S SHORT-CIR

SCU The Titan Active System® is short-circuited

4 Contact the professional who takes care of maintenance of the appliance

Remarks:
Domestic hot water production has stopped but can nonetheless be restarted using key
r.
The tank is no longer protected.
If a tank without Titan Active System® is connected to the boiler,check that the TAS
simulation connector (delivered with package AD212) is fitted to the sensor card.

D38 TA-S DISCONNEC

SCU The Titan Active System® is on an open circuit

4 Contact the professional who takes care of maintenance of the appliance

Remarks:
Domestic hot water production has stopped but can nonetheless be restarted using key
r.
The tank is no longer protected.
If a tank without Titan Active System® is connected to the boiler,check that the TAS
simulation connector (delivered with package AD212) is fitted to the sensor card.

D99 DEF.BAD PCU

SCU The SCU software version does not recognise the PCU connected

4 Contact the professional who takes care of maintenance of the appliance

6. Troubleshooting MCA 35

39

15/06/12 - 300022163-001-01

7 Technical specifications

7.1 Technical specifications

Boiler type

MCA 35

General

Flow rate setting Adjustable

Modulating, Start/Stop, 0 - 10 V

Nominal output (Pn)
Heating System (80/60 °C)

minimum-maximum kW 6,3 - 33,7

Factory setting kW 33,7

Data on the gases and combustion gases

Gas consumption - Natural gas H (G20) minimum-maximum

m3/h

0,69 - 3,71

Gas consumption - Natural gas L (G25) minimum-maximum

m3/h

0,80 - 4,32

Gas consumption - Propane G31 minimum-maximum

m3/h

0,27 - 1,44

NOx-Emission per year (n =1)

mg/kWh

42

Characteristics of the heating circuit

Water content

l 2,3

Water temperature maximum °C 110

Operating temperature maximum °C 90

Electrical characteristics

Power supply voltage

VAC 230

Power consumption - Full load

maximum W 173

Factory setting W 151

Electrical protection index

IPX4D

Other characteristics

Total weight (empty)

kg 39

Acoustic level at 1 metre at full load

dB(A) 45

MCA 35 7. Technical specifications

15/06/12 - 300022163-001-01

40

8 Energy savings

8.1 Energy-saving advice

4 Keep the room in which the boiler is installed well ventilated.

4 Do not block ventilation outlets.

4 Do not cover the radiators. Do not hang curtains in front of the

radiators.

4 Install reflective panels behind the radiators to prevent heat

losses.

4 Insulate the pipes in rooms that are not heated (cellars and lofts).

4 Close the radiators in rooms not in use.

4 Do not run hot (or cold) water pointlessly.

4 Install a water-saving shower head to save up to 40 % energy.

4 Take showers rather than baths. A bath consumes twice as much

water and energy.

8.2 Recommendations

The remote control is available in the following versions:

4 Wire

4 Radio

The setting of the control panel and/or of the remote control has a
considerable influence on energy consumption.

A few tips:

4 In the room in which the room thermostat is installed, it's advised

not to use thermostatic valve radiators. If a thermostatic valve is
used the valve must be fully opened.

4 Completely closing and opening thermostatic valve radiators

causes undesirable temperature fluctuations. Open and close
thermostatic valves in small steps.

4 Lower the temperature to around 20°C. This reduces heating costs

and energy consumption.

4 Lower the temperature when you air the rooms.

4 When setting a time schedule , bear days when you are absent

and holidays in mind.

8. Energy savings

MCA 35

41

15/06/12 - 300022163-001-01

9 Warranty

9.1 General

You have just purchased one of our appliances and we thank you for
the trust you have placed in our products.

Please note that your appliance will provide good service for a longer
period of time if it is regularly checked and maintained.

Your fitter and our customer support network are at your disposal at
all times.

9.2 Warranty terms

The following provisions are not exclusive of the buyer being able
benefit from the legal provisions applicable regarding hidden defects
in the buyer's country.

Starting from the purchase date shown on the original fitter's invoice,
your appliance has a contractual guarantee against any
manufacturing defect.

The length of the guarantee is mentioned in the price catalogue.
The manufacturer is not liable for any improper use of the appliance
or failure to maintain or install the unit correctly (the user shall take
care to ensure that the system is installed by a qualified engineer).

In particular, the manufacturer shall not be held responsible for any
damage, loss or injury caused by installations which do not comply
with the following:

4 applicable local laws and regulations,

4 specific requirements relating to the installation, such as national

and/or local regulations,

4 the manufacturer's instructions, in particular those relating to the

regular maintenance of the unit,

4 the rules of the profession.

The warranty is limited to the exchange or repair of such parts as have
been recognised to be faulty by our technical department and does
not cover labour, travel and carriage costs.

The warranty shall not apply to the replacement or repair of parts
damaged by normal wear and tear, negligence, repairs by unqualified
parties, faulty or insufficient monitoring and maintenance, faulty
power supply or the use of unsuitable fuel.

Sub-assemblies such as motors, pumps, electric valves etc. are
guaranteed only if they have never been dismantled.

The legislation laid down by european directive 99/44/EEC,
transposed by legislative decree No. 24 of 2 February 2002 published
in O.J. No. 57 of 8 March 2002, continues to apply.

MCA 35

9. Warranty

15/06/12 - 300022163-001-01

42

DUEDI S.r.l.

www.duediclima.it

Distributore Ufficiale Esclusivo

De Dietrich-Thermique Italia

Via Passatore, 12 - 12010
San Defendente di Cervasca
CUNEO

[phone]
[phone]
[e-mail]

IT

DE DIETRICH THERMIQUE Iberia S.L.U.

DE DIETRICH THERMIQUE S.A.S

www.dedietrich-calefaccion.es

Av. Princep d’Astúries 43-45

08012 BARCELONA

[phone]
[phone]

ES

AD001NU-AH

129164, Россия, г. Москва

Зубарев переулок, д. 15/1

Бизнес-центр «Чайка Плаза»,

офис 309

[phone]

© Copyright
All technical and technological information contained in these technical instructions,
as well as any drawings and technical descriptions supplied, remain our property
and shall not be multiplied without our prior consent in writing.

15/06/12

300022163- 001- 01

DEDIETRICH THERMIQUE
57,ruedelaGareF-67580MERTZWILLER-BP 30