58
Cause Remedy
The heat pump is off.
■
Turn on the ON/OFF switch: see diagrams on
page 24 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.
Central heating/central cooling must be enabled.
Check the following settings and correct if required:
■
Operating program: see page 33.
■
Room temperature: see page 33.
■
Time: see page 49.
■
Time program for central heating/central cooling: see
page 27.
■
Time program for heating water buffer cylinder: see
page 27.
■
Heating curve/cooling curve: see page 28.
■
If necessary, enable the electric booster heater for
central heating (if installed): see page 37.
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 standard DHW temperature as required.
"Note", "Warning" or "Fault" is shown.
■
Check what type of message it is. Acknowledge the
message: see page 54.
■
If necessary, notify your contractor.
"Screed drying" is activated.
■
No action required.
■
As soon as the period for screed drying has expired,
the heat pump continues in the selected operating
program: see page 26.
In conjunction with a ventilation unit:
■
Bypass does not close.
■
Preheating coil faulty
■
Supply air/extract air fan faulty
Notify your contractor.
What to do if...
Rooms are too cold
5790940
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