Viessmann Vitocrossal 100 User manual

Operating instructions
for the system user
VIESMANN
Vitocrossal 100, type CI1 with Vitotronic 100 control unit, type GC7B for constant
temperature operation
VITOCROSSAL 100
5792 952 GB 2/2017 Please keep safe.

2
Please follow these safety instructions closely to
prevent accidents and material losses.
Safety instructions explained
Danger
This symbol warns against the risk of injury.
!Please note
This symbol warns against the risk of material
losses and environmental pollution.
Note
Details identified by the word "Note" contain additional
information.
Target group
These operating instructions are intended for heating
system users.
This appliance can also be operated by children 8
years and older, as well as by individuals with reduced
physical, sensory or mental faculties or those lacking
in experience and knowledge, provided such individu-
als are being supervised or have been instructed in the
safe use of this appliance and any risks arising from it.
!Please note
Supervise children in the proximity of the appli-
ance.
■Never permit children to play with the appli-
ance.
■Cleaning and maintenance must not be car-
ried out by unsupervised children.
Appliance connection
■The appliance may only be connected and commis-
sioned by authorised contractors.
■Only operate the appliance with suitable fuels.
■Observe the specified electrical connection require-
ments.
■Modifications to the existing installation may only be
carried out by authorised contractors.
Danger
Incorrectly executed work on the heating system
can lead to life threatening accidents.
■Work on gas installations must only be carried
out by a registered gas fitter.
■Work on electrical equipment must only be
carried out by a qualified electrician.
Work on the appliance
■All settings and work on the appliance must be car-
ried out as specified in these operating instructions.
Further work on the appliance may only be carried
out by authorised contractors.
■Never open the appliance.
■Never remove casings.
■Never change or remove attachments or fitted
accessories.
■Never open or retighten pipe connections.
Danger
Hot surfaces can cause burns.
■Never open the appliance.
■Never touch the hot surfaces of uninsulated
pipes, fittings or flue pipes.
Damage to the appliance
Danger
Damaged equipment poses a safety hazard.
Check the appliance for external damage. Never
start up a damaged appliance.
Safety instructions
For your safety
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If you smell gas
Danger
Escaping gas can lead to explosions which may
result in serious injury.
■Never smoke. Prevent naked flames and
sparks. Never switch lights or electrical appli-
ances on or off.
■Close the gas shut-off valve.
■Open windows and doors.
■Evacuate any people from the danger zone.
■Notify your gas and power supply utility and
your local heating contractor from outside the
building.
■Have the power supply to the building shut off
from a safe place (outside the building).
If you smell flue gas
Danger
Flue gas can lead to life threatening poisoning.
■Shut down the heating system.
■Ventilate the installation site.
■Close all doors in the living space.
In case of fire
Danger
Fire presents a risk of burns and explosion.
■Shut down the heating system.
■Close the shut-off valves in the fuel supply
lines.
■Use a tested fire extinguisher, class ABC.
In case of water leaking from the appliance
Danger
Water leaking from the appliance poses an elec-
trocution hazard.
■Switch off the heating system at the external
isolation point (e.g. fuse box, domestic power
distribution unit).
■Notify your local heating contractor.
What to do if the heating system develops a fault
Danger
Fault messages point to faults in the heating
system. If faults are not rectified, they can have
life threatening consequences.
Never acknowledge fault messages several
times in quick succession. Inform your heating
contractor so the cause can be analysed and
the fault rectified.
Safety instructions
For your safety (cont.)
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Installation room requirements
Danger
Sealed vents result in a lack of combustion air.
This leads to incomplete combustion and the
formation of life threatening carbon monoxide.
Never cover or close existing vents.
Never make any subsequent modifications to
the building characteristics that could affect safe
operation (e.g. cable/pipework routing, cladding
or partitions).
Danger
Easily flammable liquids and materials (e.g.
naphtha, solvents, cleaning agents, paints or
paper) can cause deflagration and fire.
Never store or use such materials in the installa-
tion room or in direct proximity to the heating
system.
!Please note
Incorrect ambient conditions can lead to heating
system damage and can put safe operation at
risk.
■Ensure ambient temperatures are above 0 °C
and below 35 °C.
■Prevent air contamination by halogenated
hydrocarbons (e.g. as contained in paints, sol-
vents or cleaning fluids) and excessive dust
(e.g. through grinding/polishing work).
■Avoid continuously high humidity levels (e.g.
through continuous drying of washing).
Extractors
The operation of appliances that extract air to the out-
side (cooker hoods, extractors, air conditioning units,
etc.) can create negative pressure. If the boiler is oper-
ated at the same time, this can lead to a reverse flow
of the flue gas.
Danger
The simultaneous operation of the boiler and
appliances that extract air to the outside can
result in life threatening poisoning due to
reverse flow of the flue gas.
Take suitable steps to ensure an adequate sup-
ply of combustion air. If necessary, contact your
heating contractor.
Auxiliary components, spare and wearing parts
!Please note
Components not tested with the heating system
may damage the system or affect its function.
Have all installation or replacement work carried
out exclusively by qualified contractors.
Safety instructions
For your safety (cont.)
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1. Introductory information Intended use .......................................................................................... 6
Commissioning ...................................................................................... 6
Your system is preset at the factory ....................................................... 6
Terminology ........................................................................................... 6
Tips on saving energy ............................................................................ 7
2. Operation Controls ................................................................................................. 8
How to use the controls ......................................................................... 8
Symbols ................................................................................................. 8
3. Start-up/shutdown Switching on the heating system ........................................................... 10
Shutting down the heating system ......................................................... 10
■With frost protection monitoring .......................................................... 10
■Without frost protection monitoring (shutdown) .................................. 11
4. Central heating Required settings for central heating ..................................................... 12
Setting the heating flow temperature ..................................................... 12
Setting the operating program (central heating) .................................... 12
Switching off central heating .................................................................. 12
5. DHW heating Required settings (DHW heating) .......................................................... 13
Setting the DHW temperature ................................................................ 13
Setting the operating program (DHW heating) ...................................... 13
Switching off DHW heating .................................................................... 13
6. Further adjustments Setting the temperature unit (°C/°F) ...................................................... 14
Restoring factory settings ...................................................................... 14
7. Calling up information Scanning information and resetting values ............................................ 15
Scanning service messages .................................................................. 16
Scanning fault messages ....................................................................... 17
8. Multi boiler systems Special considerations for multi boiler systems ..................................... 18
9. Emissions test mode Starting emissions test mode ................................................................. 19
■Switching on emissions test mode ..................................................... 19
■Stopping emissions test mode ............................................................ 19
10. What to do if... Rooms are too cold ................................................................................ 20
Rooms are too hot ................................................................................. 20
There is no hot water ............................................................................. 20
The DHW is too hot ............................................................................... 21
"ã" flashes on the display ..................................................................... 21
"E" flashes on the display ..................................................................... 21
"ë" flashes on the display ..................................................................... 21
"- - EP - -" flashes on the display ........................................................... 21
11. Maintenance ................................................................................................................ 22
12. Keyword index ................................................................................................................ 24
Index
Index
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The appliance is intended solely for installation and
operation in sealed unvented heating systems that
comply with EN 12828, with due attention paid to the
associated installation, service and operating instruc-
tions. It is only designed for heating up heating water
that is of potable water quality.
Intended use presupposes that a fixed installation in
conjunction with permissible, system-specific compo-
nents has been carried out.
Commercial or industrial usage for a purpose other
than heating the building or DHW shall be deemed
inappropriate.
Any usage beyond this must be approved by the man-
ufacturer in each individual case.
Incorrect usage or operation of the appliance (e.g. the
appliance being opened by the system user) is prohibi-
ted and will result in an exclusion of liability. Incorrect
usage also occurs if the components in the heating
system are modified from their intended use (e.g. if the
flue gas and ventilation air paths are sealed).
Commissioning
Commissioning and matching the control unit to local
conditions and building characteristics, as well as
instructing the user in the operation of the system,
must be carried out by your heating contractor.
As the user of new combustion equipment, you may be
obliged to notify your local flue gas inspector of the
installation [check local regulations]. Your local flue gas
inspector will also inform you [where appropriate]
about work that may have to be carried out on your
combustion equipment (e.g. regular checks, cleaning).
Your system is preset at the factory
The control unit is preset at the factory to " " for
central heating and DHW heating.
Your heating system is therefore ready for operation:
Central heating
■The rooms are heated in accordance with the set-
tings on your control unit and room temperature con-
trol unit.
■Your heating contractor can make further settings for
you during commissioning.
You can change all settings individually at any time
to suit your requirements (see chapter "Central heat-
ing").
DHW heating
■DHW is heated to 50 °C.
■Your heating contractor can make further settings for
you during commissioning.
You can change all settings individually at any time
to suit your requirements (see chapter "DHW heat-
ing").
Frost protection
■Your boiler and DHW cylinder are protected against
frost.
Power failure
■All data is retained if there is a power failure.
Terminology
To provide you with a better understanding of the func-
tions of your control unit, the appendix contains chap-
ter "Terminology" (see page 23).
Introductory information
Intended use
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Use the adjustment options on the control unit and the
room temperature control unit:
■Do not overheat your rooms; you can save up to 6 %
on your heating bills for every degree you reduce
your room temperature.
Set your room temperature no higher than 20 °C
(see page 12).
■Do not set your DHW temperature too high (see
page 13).
■Select the operating program that meets your current
requirements:
–In the summer, if you do not want to heat any
rooms but do need DHW, select the " " operating
program (see page 13).
–If you do not want to heat any rooms and require
no DHW for a prolonged period of time, select the
" " operating program (see page 10).
Further recommendations:
■Correct ventilation/airing.
Fully open windows for a short time and close the
thermostatic valves while airing.
■Close roller shutters (if installed) at dusk.
■Set thermostatic valves correctly.
■Never cover radiators or thermostatic valves.
■Controlled use of DHW: A shower generally uses
less energy than a full bath.
Introductory information
Tips on saving energy
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You can change the settings for your heating system
centrally at the programming unit.
If you have a room temperature control unit installed in
your rooms, you can also change the settings on the
room temperature control unit.
Room temperature controller operating instruc-
tions
4 8°C
s A
Fig. 1
To take one step back in the menu.
Cursor keys
To scroll through the menu or adjust values
OK To confirm your selection or setting.
No function
Enables you to call up the menu for settings and
scanning.
How to use the controls
Default display
4 8°C
Fig. 2
Press . This takes you to the menu for settings and
scanning.
Symbols
These symbols are not always displayed, but appear
subject to the system version and the operating condi-
tion. Flashing displays indicate that modifications can
be made.
Menu
Central heating
DHW heating
Information
Emissions test mode
Additional settings
Operating program
Frost protection monitoring (standby mode)
DHW heating
Central heating and DHW heating
Messages
Service message
ýThe service interval has expired
Fault message
Burner fault message
Displays
Temperature
Frost protection monitoring
Operation
Controls
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Central heating
Boiler circuit pump running
Cylinder loading pump running
In conjunction with a solar thermal system:
Solar circuit pump running
Burner running
Standard factory setting
Operation
Symbols (cont.)
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C D
B
A
4 8°C
s A
Fig. 3
AFault indicator (red)
BON indicator (green)
CReset button
DON/OFF switch
1. Check the heating system pressure at the
pressure gauge. The system pressure is too low if
the indicator points to the area below the red field.
In this case, top up with water or notify your heat-
ing contractor.
Ask your heating contractor about the follow-
ing:
■Level of the required system pressure
■Position of the following components:
–Pressure gauge
–Shut-off valve
–Gas shut-off valve
–Vents
2. For open flue operation:
Check that the vents in the installation room are
open and unrestricted.
Note
With open flue operation, the combustion air is
drawn from the installation room.
3. Open the gas shut-off valve.
Note
Ask your heating contractor to explain the position-
ing and handling of these components.
4. Switch ON the power supply, e.g. at a separate
MCB/fuse or a mains isolator.
5. Turn on the ON/OFF switch " ".
After a short while, the standard display appears
and the green ON indicator illuminates. Your heat-
ing system and room temperature control unit are
now ready for operation.
Shutting down the heating system
With frost protection monitoring
Select operating program " " for frost protection moni-
toring (standby mode).
Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. OK to confirm; " " flashes.
4. until " " flashes.
5. OK to confirm; frost protection is activated.
■No central heating.
■No DHW heating.
■Frost protection for the boiler and the DHW cylinder
is enabled.
Note
The circulation pumps are briefly started every 24
hours to prevent them from seizing up.
Ending operating program " "
Select another operating program.
Start-up/shutdown
Switching on the heating system
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Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. OK to confirm; " " flashes.
4. until " " flashes; the rooms and DHW are
heated.
or
until " " flashes: DHW is heated but there is
no central heating.
5. OK to confirm; the selected operating program is
activated.
Without frost protection monitoring (shutdown)
1. Turn off the ON/OFF switch " ".
2. Close the gas shut-off valve.
Note
Ask your heating contractor to explain the position-
ing and handling of these components.
3. Isolate the heating system from its main power
supply, e.g. at the separate MCB/fuse or at a
mains isolator.
4. If outside temperatures below 3 °C are expected,
please take appropriate measures to protect the
heating system from frost. If necessary, contact
your heating contractor.
Start-up/shutdown
Shutting down the heating system (cont.)
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If you require central heating, check the following
points:
■Have you set the required room temperature?
Room temperature controller operating
instructions
■Have you set the heating flow temperature at a suffi-
ciently high level?
For settings, see the next chapter.
■Have you set the correct operating program?
For settings, see page 12
and
Room temperature controller operating
instructions
■Have you set the required time program?
Room temperature controller operating
instructions
Setting the heating flow temperature
Set the heating flow temperature sufficiently high so
the required room temperature can be achieved.
Factory setting: 74 °C
Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. for boiler water temperature; " " flashes.
4. OK to confirm; the selected temperature flashes.
5. / for the required boiler water temperature.
6. OK to confirm; the new temperature value is
saved.
Setting the operating program (central heating)
Factory setting: " " for central heating and DHW
heating (winter mode)
Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. OK to confirm.
4. / until " " flashes.
5. OK to confirm; the rooms and DHW are heated.
Switching off central heating
You do not want to heat any rooms but do want to
heat DHW.
Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. OK to confirm; " " flashes.
4. until " " flashes.
5. OK to confirm; central heating is disabled and
DHW is heated (summer mode).
You do not want to heat any rooms or DHW.
Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. OK to confirm; " " flashes.
4. until " " flashes.
5. OK to confirm; central heating and DHW heating
are disabled, frost protection monitoring is acti-
vated (standby mode).
Central heating
Required settings for central heating
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If you want DHW heating, check the following points:
■Have you set the required DHW temperature?
For settings, see the next chapter.
■Have you set the correct operating program?
For settings, see page 13.
Setting the DHW temperature
Factory setting: 50 °C
Press the following keys:
1. for settings; " " flashes.
2. for " ".
3. OK to confirm; temperature flashes.
4. / for required DHW temperature.
5. OK to confirm; the new temperature value is
saved.
Setting the operating program (DHW heating)
Factory setting: " " for central heating and DHW
heating (winter mode)
Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. OK to confirm; " " flashes.
4. / until " " flashes for DHW heating (summer
mode, no central heating).
or
until " " flashes for central heating and
DHW heating (winter mode).
5. OK to confirm; the selected operating program is
activated.
Switching off DHW heating
You do not want to heat DHW, but you do want to
heat the rooms.
Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. OK to confirm; " " flashes.
4. until " " flashes.
5. OK to confirm; the rooms and DHW are heated
(winter mode).
6. for settings; " " flashes.
7. for " ".
8. OK to confirm; temperature flashes.
9. to 10 °C.
10. OK to confirm; the new temperature value is
saved.
You do not want to heat any rooms or DHW.
Press the following keys:
1. for settings; " " flashes.
2. OK to confirm; " " flashes.
3. OK to confirm; " " flashes.
4. until " " flashes.
5. OK to confirm; DHW heating and central heating
are disabled, frost protection monitoring is acti-
vated (standby mode).
DHW heating
Required settings (DHW heating)
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Factory setting: °C
Press the following keys:
1. for settings; " " flashes.
2. for " ".
3. OK to confirm; " " flashes.
4. / for required temperature unit ("°C" or "°F").
5. OK to confirm; the new temperature unit is saved.
Restoring factory settings
You can simultaneously reset all changed values to
their factory settings.
Press the following keys:
1. for settings; " " flashes.
2. for " ".
3. OK to confirm; " " flashes.
4. OK to confirm; the factory settings are reinstated.
Factory settings:
■Operating program: " "
■Boiler water temperature: 74 °C
■DHW temperature: 50 °C
Further adjustments
Setting the temperature unit (°C/°F)
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Subject to the components connected and the settings
made, you can scan current temperatures and operat-
ing conditions.
Press the following keys:
1. for settings; " " flashes.
2. for " ".
3. OK to confirm.
4. / for the required information.
5. OK to confirm; if you want to reset the value to "0"
(see following table), " " flashes.
6. OK to confirm; the value is reset.
Example:
On the display, you can see "3" which shows the boiler
water temperature. The current boiler water tempera-
ture is 65 °C.
¸
3 6 5°C
Fig. 4
Note
The scan mode terminates automatically after
30 minutes or if you press .
Information appears in the following sequence:
Shown on display Meaning Notes
0 10 LON subscriber number –
1 15 °C Outside temperature Displayed only if an outside temperature
sensor is connected.
2 95 °C Flue gas temperature –
3 65 °C Boiler water temperature –
4 45 °C Temperature of heating water buf-
fer cylinder or low loss header
Displayed only if a heating water buffer cyl-
inder or low loss header is connected.
5 50 °C DHW temperature Displayed only if a DHW cylinder is connec-
ted.
51 50 °C DHW temperature, top Displayed only if two cylinder temperature
sensors are connected.
52 50 °C DHW temperature, bottom
5c 95 °C Collector temperature Displayed only if a Viessmann solar control
module is installed.
5□ 45 °C DHW temperature with solar oper-
ation
Displayed only if a solar thermal system is
connected.
53 50 °C Temperature sensor /Displayed only if the Viessmann solar con-
trol module is available and a third tempera-
ture sensor is connected.
54 50 °C Temperature sensor aÖ Displayed only if the Viessmann solar con-
trol module is available and a fourth temper-
ature sensor is connected.
6 70 °C Collector temperature Displayed only if a solar thermal system is
connected.
2 6 3 5 7 2 h Burner hours run Number of hours run.
The hours run can be reset to "0" with "D".
1
0 3 0 5 2 9 Burner starts The number of burner starts can be reset to
"0" with "D".
3
0 0 1 4 1 7 h Hours run, solar circuit pump Displayed only if a Viessmann solar control
module is installed.
The hours run can be reset to "0" with "D".
5
Calling up information
Scanning information and resetting values
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Shown on display Meaning Notes
0 0 1 4 2 5 Pump starts, solar circuit pump Displayed only if a Viessmann solar control
module is installed.
Pump starts can be reset to "0" with "D".
6
0 0 0 5 0 6 h Hours run, output 22 Displayed only if the Viessmann solar con-
trol module is available and a second circu-
lation pump has been connected.
The hours run can be reset to "0" with "D".
7
0 0 0 5 0 6 Pump starts, output 22 Displayed only if the Viessmann solar con-
trol module is available and a second circu-
lation pump has been connected.
Pump starts can be reset to "0" with "D".
8
0 0 2 8 5 0 Solar yield in kWh Displayed only if a Viessmann solar control
module is installed.
The yielded solar energy can be reset to "0"
with "D".
9
Scanning service messages
Your heating contractor can set a service interval. For
example, service after 2500 hours run by the burner or
service after 12 months.
If your heating system is due for a service, " " flashes
on the display and the expired service interval is
shown.
Example:
Service display with the service interval of 2500 hours
run by the burner:
0
ë
2 5 0h
Fig. 5
Service display with the service interval of 12 months:
1
ë
2
Fig. 6
Notify your heating contractor. Acknowledge the serv-
ice message with OK.
Note
If the service can only be carried out later, the service
message will reappear after 7 days.
Calling up an acknowledged service message
Hold down OK for approximately 4 seconds.
Calling up information
Scanning information and resetting values (cont.)
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If any faults have occurred in your heating system,
symbol " " flashes on the display and the fault code
is shown. The red fault indicator also flashes (see
page 10).
Example:
Fault code shown: "50"
1 5 0
ã
Fig. 7
Danger
If faults are not rectified, they can have life
threatening consequences.
Do not acknowledge fault messages several
times in quick succession. If a fault occurs
repeatedly, notify your heating contractor so the
cause can be analysed and the fault rectified.
1. Inform your heating contractor of the fault code.
This enables the heating contractor to be better
prepared for the service call and may save addi-
tional travelling costs.
2. Acknowledge the fault message with OK. Symbol
" " no longer flashes.
Note
■If you have connected signalling equipment to
indicate fault messages (e.g. a buzzer), this is
deactivated when the fault message is acknowl-
edged.
■If the fault can only be fixed later, the fault mes-
sage will reappear the following day.
Calling up an acknowledged fault message
Hold down OK for approximately 4 seconds.
Note
If there are several fault messages, you can call these
up in sequence by pressing / .
Calling up information
Scanning fault messages
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In systems with several boilers (multi boiler systems),
each boiler is equipped with its own control unit. These
control units are regulated by a higher control unit.
Make the required settings (e.g. room temperature) at
the higher control unit.
Operating instructions of the higher control unit
Boiler number
In multi boiler systems, each boiler control unit indi-
cates the boiler number on the standard display.
Example:
Boiler number "3"
34 8°C
Fig. 8
Boiler number "3"
30
Fig. 9
Operating program
■" " For frost protection monitoring (standby mode):
By selecting the " " operating program, you shut
down the respective boiler individually.
Boiler frost protection monitoring is active.
■" " For DHW heating (summer mode):
You cannot set the " " operating program.
Room temperature/boiler water temperature
You cannot set either room temperature or boiler water
temperature.
Multi boiler systems
Special considerations for multi boiler systems
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Switching on emissions test mode
Emissions test mode should only be activated by your
flue gas inspector during the annual inspection.
Press the following keys:
1. for settings; " " flashes.
2. for " ".
3. OK to confirm; "ON" flashes.
4. OK to start the burner for checking; "ON" will be
displayed constantly.
5. OK to start the burner for the test.
"ON" is constantly displayed.
The standard display appears after 4 seconds.
Stopping emissions test mode
Press the following keys:
1. for settings; " " flashes.
2. for " ".
3. OK to confirm; "OFF" flashes.
4. OK to confirm.
Note
Emissions test mode ends automatically after
30 minutes.
Emissions test mode
Starting emissions test mode
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Cause Remedy
The heating system is switched off. ■Turn on the ON/OFF switch " " (see page 10).
■Switch ON the mains isolator if installed (outside the
boiler room).
■Set the MCB in the power distribution board (main do-
mestic MCB).
Control unit or room temperature controller incorrectly
adjusted.
Check the settings and correct if required:
■" " must be set (see page 12)
■Room temperature or boiler water temperature (see
page 12)
■Time program
Room temperature controller operating instruc-
tions
Only when operating with DHW heating:
DHW priority is enabled (" " is displayed).
Wait until the DHW cylinder has been heated up (" "
disappears).
In the case of operation with an instantaneous water
heater, stop DHW draw-off.
No fuel. For operation with LPG:
Check the fuel reserves and re-order if required.
For operation with natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
" " is shown on the display. Press "R" (see page 10).
Acknowledge the fault message with OK (see page 17).
Notify your heating contractor of the fault code if the
fault reoccurs.
" " is shown on the display. Notify your heating contractor of the fault code shown.
Acknowledge the fault message with OK (see page 17).
Rooms are too hot
Cause Remedy
Control unit or room temperature controller incorrectly
set.
Check the settings and correct if required:
■Room temperature or boiler water temperature (see
page 12)
■Time program
Room temperature controller operating instruc-
tions
" " is shown on the display. Inform your heating contractor of the fault code.
Acknowledge the fault message with OK (see page 17).
There is no hot water
Cause Remedy
The heating system is off. ■Turn on the ON/OFF switch " " (see page 10).
■Switch ON the mains isolator if installed (outside the
boiler room).
■Set the MCB in the power distribution board (main do-
mestic MCB).
Control unit incorrectly set. Check the settings and correct if required:
■DHW heating must be enabled (see page 13).
■DHW temperature (see page 13).
What to do if...
Rooms are too cold
5792 952 GB