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Cause Remedy
Settings made at the heat pump control unit have been
changed or are incorrect.
Central heating/central cooling must be enabled.
Check the following settings and correct if required:
Operating program: See page 26.
Room temperature: See page 26.
Time: See page 51.
Time program for central heating/central cooling: See
page 27.
Central cooling time program for buffer cylinder: See
page 29.
Heating curve/cooling curve: See page 29.
If necessary, select central cooling for the buffer cylin-
der: See page 27.
Enable "Active cooling mode" if required: See
page 40.
"Note", "Warning" or "Fault" is shown. Check what type of message it is. Acknowledge the
message: See page 56.
If necessary, notify your contractor.
In conjunction with a ventilation unit:
The bypass does not open.
Check the following settings and correct if required:
Room temperature for ventilation "Set room temper-
ature": See page 26.
Minimum temperature for ventilation "Min supply air
t. byp": See page 44.
If necessary, notify your contractor.
There is no hot water
Cause Remedy
The heat pump is off. Turn on the ON/OFF switch: See diagrams on
page 60 onwards.
Switch ON the mains isolator (if installed, outside the
boiler room).
Set the MCB in the power distribution board (main do-
mestic MCB).
Settings made at the heat pump control unit have been
changed or are incorrect.
DHW heating must be enabled.
Check the following settings and correct if required:
Operating program: See page 26.
DHW temperature: See page 35.
Time program DHW heating: See page 35.
Time: See page 51.
If necessary, enable the electric booster heater for
DHW heating (if installed): See page 39.
"Note", "Warning" or "Fault" is shown. Check what type of message it is. Acknowledge the
message: See page 56.
If necessary, notify your contractor.
The DHW is too hot
Cause Remedy
Settings made at the heat pump control unit have been
changed or are incorrect.
Check and if necessary correct the standard DHW tem-
perature: See page 35.
What to do if...
Rooms are too hot
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