Pichler PKOM4 - Page 55

OPERATING AND INSTALLATION MANUAL HEAT PUMP COMBI UNIT PKOM4 PAGE 55
USER
GENERALSPECIALIST PERSONNEL
57
Heating/cooling
low-pressure
fault
The evaporator is frozen Troubleshooting and correction as in the case of error 56
Too low air volume flow via
the evaporator
Check air volume flow on the exhaust side
Lack of refrigerant
Not enough refrigerant in the "heating/cooling"
cooling circuit
Leakage search and removal of the leakage
in the "heating/cooling" cooling circuit
Expansion valve EV2 does
not open
Check terminals EV2 on heat pump board N3 Restore terminal contacts
Check expansion valve drive M14 Replace the expansion valve drive
Check expansion valve EV2 Replace the expansion valve
Expansion valve EV3 does
not open
Check terminals EV3 on heat pump board N3 Restore terminal contacts
Check expansion valve drive M15 Replace the expansion valve drive
Check expansion valve EV3 Replace the expansion valve
No error detectable Please contact your service partner
58
Service water
low-pressure
fault
The compressor is frozen Troubleshooting and correction as in the case of error 56
Too low air volume flow via
the evaporator
Check air volume flow on the exhaust side
Lack of refrigerant
Not enough refrigerant in the "service water"
cooling circuit
Leakage search and removal of the leakage
in the service water cooling circuit
Expansion valve EV2 does
not open
Check terminals EV2 on heat pump board N3 Restore terminal contacts
Check expansion valve drive M14 Replace expansion valve drive M14
Check expansion valve EV2 Replace expansion valve EV2