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Cause Remedy
The heat generator is switched off. Turn on the ON/OFF switch: See page 49.
Switch on the MCB on the power distribution board
(main domestic MCB).
Incorrect control unit settings.
The remote control (if installed) is set incorrectly.
Remote control operating instructions
DHW heating must be enabled.
Check the settings and correct if required:
Operating program: See page 19.
DHW temperature: See page 33.
Time: See page 37.
Time program for DHW heating: See page 33.
The holiday program is switched on for all heating cir-
cuits: See page 32.
No fuel. Open the gas shut-off valve. If necessary, check with
your gas supply utility.
"Fault" is displayed. Check what type of fault it is. Note the fault message
and acknowledge the fault: See page 44.
You may have to notify your contractor.
"Screed drying" is switched on No action required.
After expiry of the screed drying time, the selected op-
erating program is switched on.
The DHW is too hot
Cause Remedy
Incorrect settings at the control unit. Check and correct the set DHW temperature if re-
quired: See page 33.
The hygiene function is switched on. Wait until the hygiene function has been completed.
No power generation
Cause Remedy
Fuel cell has shut down as no heat transfer through the
DHW cylinder or heating circuits is possible.
Wait until heat transfer is possible again.
Fuel cell in regeneration phase Wait until the regeneration phase has been completed.
Note
After approx. 120 hours of operation, the fuel cell will
briefly shut down for regeneration. This ensures that
the power generating performance is maintained.
"Power generation OFF" is selected. Switch on the energy manager: See page 27.
The 6 year service interval has expired. Please notify your heating contractor so that the service
can be carried out.
The 12 year service interval has expired. Please notify your heating contractor so that the service
can be carried out.
The total service life of the fuel cell (20 years) has been
exceeded.
Please notify your heating contractor.
Power export is briefly interrupted. If a fault message is displayed, please notify your heat-
ing contractor: See chapter "System characteristics dur-
ing a mains fault".
What to do if...
There is no hot water
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