DIAGNOSTIC CHART
PROBLEM POSSIBLE CAUSE TEST PROCEDURE - ACTION
Compressor will not start No power at ON / OFF switch Plug in electrical outlet or turn on breaker.
No power at the compressor Press power switch to ON.
No power at the outlet Check with test lamp or volt meter.
Should supply 110-120 volts AC, 60 HZ.
Thermostat: Turn knob clockwise
a. Turned off Place jumper between terminals. If comp-
b. Points not closing ressor starts, thermostat is defective and
should be replaced.
Relay or overload Using starting cord, check compressor
Directly. If compressor starts, check relay
And overload individually with ohmmeter
and
Replace one found defective. If compressor
doesn’t start, replace compressor.
Loose connections Check circuit from power source to comp-
ressor using wiring diagram as guide.
Run capacitor Check capacitor, replace if defective.
Motor windings open, Check windings with ohmmeter. See wiring
shorted or grounded diagram for resistance values. Replace
Compressor if motor is defective.
Timer Timer may be in defrost cycle. Turn
clockwise past 2 o’clock.
Wired wrong.
Check timer and replace if defective.
Compressor stuck Try starting with starter cord. If compressor
won’t start, change compressor.
Compressor runs, but no Moisture restriction Heat frosted area. If frost line moves farther
refrigeration or insuf-
along coil after heating, restriction was prob
-
ficient refrigeration. Heavy frost around evaporator
ably caused by moisture freeze up. Discharge
unit, sweep the system and recharge.
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