Fault Finding; Compressor Won't Start - Dead; Compressor Won't Start - Hums; Compressor Starts, Runs And Then Stops - Fisher & Paykel RF201A Service Manual

13

FAULT FINDING

13.1

COMPRESSOR WON'T START - DEAD

Checks to be carried out:
1. Check the fuse and power outlet.
2 Check that there is the correct voltage from the power module to the compressor.
3. Continuity test the 3 pin plug, terminal block and the harness to the compressor.
Check the compressor windings (6.40 Ω).
4.
5. Replace the inverter and retest the compressor.
NOTE: A manual starting kit should NOT be used on Variable Capacity Compressors (VCC).
Do NOT under any circumstances place line voltage straight onto compressor.
13.2

COMPRESSOR WON'T START - HUMS

Possible Causes:
1. The voltage may be low e.g. 10% low. Test the voltage under load.
2. Check the voltage to the inverter from the power module.
3. System pressures may not be equalised; too short an off cycle.
4. Check the start and run windings with an ohm meter.
13.3

COMPRESSOR STARTS, RUNS AND THEN STOPS

Possible Causes:
1. Low voltage - high voltage.
2. Check the compressor voltage matches the supply voltage.
3. The system may be grossly overcharged. Liquid refrigerant entering the compressor low side
causing slugging of oil.
4. Check the current draw – if an overload is detected, the compressor will try to restart.
5. The high pressure side may be fully or partially blocked. Very high head pressure. Normally a
blockage before the condenser.
6. The condenser may be too hot, e.g. air movement blocked or ambient temperature too high. The
refrigerator may be too close to a heating appliance.
7. Check the compressor pipe connections.
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