Tecumseh AH5540E Service Handbook page 43

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