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Cause Remedy
The heat pump is switched off. Reset the MCB in the power distribution board (main
domestic MCB).
Switch ON the mains isolator (if installed, outside the
boiler room).
Turn on the ON/OFF switch: See page 50.
Settings have been changed or are incorrect. Room heating must be switched on.
Check the settings and correct if required:
Operating programs: See page 21.
Room temperature: See page 28.
Time: See page 40.
Time program for room heating: See page 29.
Heating curve: See page 29.
The holiday program is switched on: See page 32.
The DHW cylinder is being heated. Wait until the DHW cylinder has been heated up.
Reduce the DHW draw-off rate or temporarily reduce
the set DHW temperature if necessary.
In conjunction with an external heat generator: There is
no fuel for the external heat generator.
With LPG:
Check the fuel reserves and re-order if required.
With natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
With oil:
Check the fuel reserves and re-order if required.
"Status", "Warning", "Information", "Faults" or
"Service messages" is shown on the display.
Check what type of fault it is.
Make a note of the fault message and acknowledge
the fault: See page 47.
Please notify your heating contractor.
"Screed drying" is switched on. No action required.
After expiry of the screed drying time, the selected op-
erating program is switched on.
Separate buffer cylinder is in "Cooling mode". Select "Buffer mode" in "Heating mode": See
page 29.
Rooms are too hot
Cause Remedy
Settings have been changed or are incorrect. Check the settings and correct if required:
Operating programs: See page 21.
Room temperature: See page 28.
Time: See page 40.
Time program for room heating/room cooling: See
page 29.
Heating curve: See page 29.
The "Holidays at home" function is switched on:
See page 31.
"Status", "Warning", "Information", "Faults" or
"Service messages" is shown on the display.
Check what type of fault it is.
Make a note of the fault message and acknowledge
the fault: See page 47.
Please notify your heating contractor.
What to do if...
Rooms are too cold
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