49
Cause Remedy
The heat pump is switched off.
■
Turn on the ON/OFF switch: See page 45.
■
Switch on the mains isolator (outside the boiler room,
if installed).
■
Reset the MCB in the power distribution board (main
domestic MCB).
Settings have been changed or are incorrect. DHW heating must be enabled.
Check the settings and correct if required:
■
Operating program for DHW heating: See page 19.
■
DHW temperature: See page 30.
■
Time: See page 36.
■
Time program for DHW heating: See page 30.
■
The holiday program is switched on for all heating/
cooling circuits: See page 28.
"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 43.
■
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.
The DHW is too hot
Cause Remedy
Incorrect settings Check and correct the set DHW temperature if re-
quired: See page 30.
The hygiene function is switched on. Wait until the hygiene function has been completed.
DHW temperature for DHW heating is set too high at
your solar PV system
Have your contractor change the setting at your solar
PV system.
"Warning" is displayed
Cause Remedy
Warning due to a specific event or operating state of
the heat pump or heating system
Proceed as described on page 44.
"Fault" is displayed
Cause Remedy
Heat pump or heating system fault Proceed as described on page 43.
"External hook-up" is displayed
Cause Remedy
The operating program selected at the heat pump con-
trol unit was changed over by an external switching de-
vice.
No action required
What to do if...
There is no hot water
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