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Defrost Heater (All models except Mullion Evaporator Design)
The Defrost heater can be tested with an ohmmeter set on the Rx1K scale.
To Test the Defrost Heater:
1. Follow the procedure for removing the control box on the specific unit being serviced.
2. Locate the test lead plug inside the control box.
3. Set the volt-ohm meter to the Rx1 scale.
4. Place one probe of a VOM in the brown wire terminal of the test lead plug. Place the other
probe on any white wire connector. The VOM should show continuity.
Brown
Wire
Any
White Wire
Connector
Compressor
The Compressor can be tested with an Ohmmeter.
To Test the Compressor:
1. Remove the PTC Start Relay and Overload Protector from the terminals of the compressor.
2. Place the probes of a VOM (Rx1 scale) on terminals "C" and "S". The VOM should read
between 6 and 22 ohms.
3. Place the probes of a VOM on terminals "C" and "M". The VOM should read between1.5
and 6 ohms.
4. Place the one probe of a VOM (highest scale) on terminal "C" and scratch through the paint
on the compressor body so the probe contacts bare metal. The VOM should read infinity
(open circuit).
NOTE: Main motor winding may be designated as M or R.
NOTE: In Mullion Evaporator Models the test
lead wire color is blue.
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