COMPRESSOR TROUBLESHOOTING GUIDES
WON’T START. Open line circuit. Check wiring, fuses, receptacle.
NO HUM.
Protector open. Wait for reset—check current.
Control contacts open. Check control, check pressures.
Open circuit in stator. Replace stator or compressor.
WON’T START. HUMS Improperly wired. Check wiring against diagram.
INTERMITTENTLY.
(cycling on protector)
Low line voltage. Check main line voltage, determine location
of voltage drop.
Open starting capacitor. Replace starting capacitor.
Relay contacts not closing. Check by operating manually. Replace relay
if defective.
Open circuit in start winding. Check stator leads. If leads are all right,
replace compressor.
Stator winding grounded (normally Check stator leads. If leads are all right
will blow fuse.) replace compressor.
High discharge pressure. Eliminate cause of excessive pressure.
Make sure discharge shut-off and receiver.
valves are open if applicable.
Tight compressor. Check oil level—correct binding condition, if
possible. If not, replace compressor.
Weak starting capacitor or one weak Replace.
capacitor of a set.
COMPRESSOR STARTS - Low line voltage. Bring up voltage.
MOTOR WON’T GET OFF
STARTING WINDING.
Improperly wired. Check wiring against diagram.
Defective relay. Check operation—replace relay if defective.
Running capacitor shorted. Check resistances. Replace capacitor if
defective.
Starting and running windings shorted. Check capacitance - replace if defective.
Starting capacitor weak or one of a set open. Check capacitance. Replace if defective.
High discharge pressure. Check discharge shutoff valves.
Check pressure.
Tight compressor. Check oil level. Check binding. Replace
compressor if necessary.
MAINTENANCE & REPAIR 59
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