38
What to do if ...
Troubleshooting guide
(cont.)
What to do if ...
Cause
Remedy
... the heat pump does
not operate
System On/Off switch on
the heat pump is
switched off
Switch on
The fuse in the power
distribution (domestic
mains fuse) or in the
control unit has blown
Notify your local
specialist
Control unit incorrectly
programmed or set up
Check and, if necessary,
correct the setting of the
operating mode selector
and the time switch
programming
Control unit fault
The heat pump may be
operated temporarily
after reference with
your local specialist by
turning the operating
mode selector "
3
"
... rooms are too cold,
even though the heat
pump operates
DHW priority (only when
operating with a DHW
cylinder) or
control unit incorrectly
programmed or set up
Wait, until the DHW
cylinder has been
heated up or
change the control unit
settings
... heating circuit with
mixer exists and
boiler operates, but
the heating circuit
remains cold
Mixer motor faulty
Unhook the motor lever
and manually set the
mixer lever. Notify your
local specialist
... the display is faulty
Notify your local
specialist
5592
415GB
