28
SET Energietechnik Ltd. * August-Blessing-Str. 5 * D-71282 Hemmingen * Tel.: +49 (0)7150 9454-0 Fax: +49 (0)7150 2337
Heat pump troubleshooting table
It is essential to disconnect the device from the mains before undertaking electrical work!
Work on the refrigeration part may only be carried out by experts.
Complaint
Possible fault
Possible cause and solution
As a general rule in
the event of faults:
Check all cable contacts to the regulator and on the protection
plate for tightness and possible arcing spots.
Error codes in the regulator indicate the cause of the fault
Rattling, humming or
clanking
Rattling
“Fluttering” contactor
Rattling or humming
Crankcase heating has become loose
and must be reattached, compressor
mounting replaced, compressor
vibration damper replaced
Rattling or humming or
clanking
Device is not horizontal, cables or
pipeline touching each other or the
device housing
Compressor in heat
pump does not switch
on, or only briefly
Lack of water
Check filter pump; check ball valve
position on the water pipework; there
may be too little upstream pressure in
the pump
Low pressure fault
(error code A02)
Lack of refrigerant/evaporator dirty,
starting capacitor defective; faulty fan,
very cold water
Fan in heat pump
does not switch on
High pressure fault
(error code A01)
Lack of water
Faulty fan, starting capacitor is faulty
Condensate pan
overflowing
Heavy contamination of the
condensate pan, drainage blocked,
faulty installation of the condensate line
(slope, more than one siphon etc.)
Motor protection error
message in 400V
system
Overcurrent trip is set
incorrectly, defective
compressor, e.g. interwinding
fault, contactor coil or RC
element is defective, 1 or 2
phases are missing
Set overcurrent trip to nominal current,
press unlock button on the overcurrent
trip, replace parts, check power supply,
the overcurrent trip should be set to “H”