35
Table 4-1: Troubleshooting Chart
Complaint Possible Causes Response
Compressor will not start -
hums but trips on thermal pro-
tector
Improperly wired Check against wiring diagram
and wire properly
Low voltage to compressor Turn off system until proper
voltage is restored
System component, such as
thermostat or control/ contac-
tor, not functioning properly
Refer to the OEM service
information
Compressor electrical prob-
lems:
1. Compressor motor has a
winding open or shorted
2. Start capacitor not work-
ing properly
3. Relay does not close
See "Identifying Compressor
Electrical Problems" on pages
40-41
Liquid refrigerant in compres-
sor
Add crankcase heater and a
suction line accumulator. It
is difficult to determine how
liquid refrigerant got into the
compressor. A crankcase
heater along with a suction-
line accumulator will prevent
liquid refrigerant from getting
into the compressor
Internal mechanical trouble in
compressor.
See "Checking for Adequate
Compressor Pumping" on
page 70
Compressor starts, but does
not switch off of start winding
Improperly wired Check against wiring diagram
and wire properly
Low voltage to compressor Turn off system until proper
voltage is restored
Compressor electrical prob-
lems:
1. Compressor motor has a
winding open or shorted
2. Relay failing to open
3. Run capacitor not working
properly
See "Identifying Compressor
Electrical Problems" on pages
40-41
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