HIWARM
50
All copying, even partial, of this manual is strictly forbidden
RG66007967 - Rev 02
The most common causes that can block the heat pump or cause a malfunction are listed in the following pages. They are
listed according to the easily identifiable symptoms.
7.1
TROUBLESHOOTING
7 - MAINTENANCE AND AFTER SALES SERVICE
WARNING
Be very careful when carrying out the various recommended problem-solving operations:
over-confidence can cause serious injuries for unskilled persons. It is therefore recommended
to contact the manufacturer or a qualified technician after having identified the cause.
FAULT
ANALYSIS OF POSSIBLE CAUSES
CORRECTIVE ACTION
The unit does not start-up.
No power supply.
Check its presence both on the primary
and auxiliary circuit.
The circuit board is not powered.
Check the fuses.
Alarms have been triggered.
Check the microprocessor panel for
triggered alarms, eliminate their cause
and restart the unit.
Faulty
high
pressure.
Insufficient air flow rate to the
condenser.
Check that all fans turn correctly.
Check the condenser air inlet T and
prevent any recirculation.
Check that the maximum RMS voltage
reaches the fans. If necessary, check the
pressure transducers that control the
revolution controller [optional].
Make sure the finned coils are clean.
Air in the circuit, detected by air
bubbles on the flow indicator and sub-
cooling values reaching over 5°C.
Drain and pressurise the circuit and
then verify whether there are any leaks.
Drain the circuit slowly [more than 3
hours] up to 15 Pa and then recharge in
the liquid phase.
Unit too loaded, detected by sub-
cooling values reaching over 8°C.
Drain the circuit.
Clogged thermostatic valve and /
or filter. Such faults may occur in the
presence of low pressure.
Check the temperature upstream and
downstream the valve and filter and
have them replaced, if necessary.
Insufficient water flow rate in heat
pump mode.
Check the pressure drops of the water
circuit and/or the correct operation of
the pump [rotation direction]. Check
the outlet water T and make sure it is
45°C or less.
