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13
Trouble shooting
This section provides useful information for
diagnosing and correcting certain troubles which
may occur in the unit.
This troubleshooting and related corrective
actions may only be carried out by your local
technician.
13.1 General guidelines
Before starting the troubleshooting procedure,
carry out a thorough visual inspection of the
unit and look for obvious defects such as loose
connections or defective wiring.
Warning:
A
When carrying out an inspection on
the switch box of the unit, always
make sure that the main switch of
the unit is switched off.
When a safety device was activated, stop the unit
and find out why the safety device was activated
before resetting it. Under no circumstances can
safety devices be bridged or changed to a valve
other than the factory setting. If the cause of the
problem cannot be found, call your local dealer.
If the pressure relief valve is not working correctly
and is to be replaced, always reconnect the
flexible hose attached to the pressure relief valve
to avoid water dripping out of the unit!
Note:
C
For problems related to the optional
solar kit for domestic water heating,
refer to the troubleshooting in the
Installation and owner's manual for
that kit.
104 / 276 EN
13.2 General symptoms
Symptom 1: The unit is turned on but the unit is
not heating or cooling as expected
Possible
causes
•
•
•
•
The water flow
is too low.
•
•
Make sure that the water
volume in the installation is
The water
above the minimum required
volume in the
installation is
valve (refer to "9.4.2 Water
too low.
volume and sizing expansion
vessels").
Heat Pump Monobloc Inverter / User Manual
Corrective action
Check that all shut off
valves of the water circuit
are in the right position.
Check if the water filter is
plugged.
Make sure there is no air
in the water system.
Check the water pressure.
The water pressure must
be >1 bar (water is cold).
Make sure that the
expansion vessel is not
broken.
Check that the resistance
in the water circuit is not
too high for the pump.
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