December 1997 43 RS1300003 Rev. 0
Component Testing
Component Description Test Procedures
Thermostat Thermostat is in a series circuit with
defrost terminators, defrost heater, and
evaporator fan motor. Circuit is complete
if evaporator fan motor operates when
cold.
Controls the circuit from freezer
thermostat through defrost terminator to
defrost heater. Opens and breaks circuit
when thermostat senses preset high
temperature.
After defrost thermostat opens,
thermostat remains open until end of
defrost cycle and refrigerator starts
cooling again and defrost thermostat
senses a preset low temperature and
closes.
Test continuity across terminals.
With power off and evaporator coil below freezing, thermostat should check
continuous when checked with ohmmeter. See “Heater, evaporator (defrost)”
section for additional tests.
Timer, defrost Timer motor operates only when freezer
control is closed. After specified amount
Of actual operator time, inner cam in
timer throws the contacts from terminal
4, the compressor circuit to terminal 2,
and defrost thermostat/defrost heater
circuit.
After 33 minutes of defrost cycle time,
timer cam resets the circuitry through
terminal 4 to compressor.
1. To check timer motor winding, check for continuity between terminals 1 and
3 of timer.
2. Depending on the rotation of the cam, terminal 1 of timer is common to both
terminal 2, the defrost modes, or terminal 1, the compressor mode. There
should never be continuity between terminals 2 and 4.
3. With continuity between terminals 1 and 4, rotate timer knob clockwise until
audible click is heard. When the click is heard, the reading between
terminals 1 and 4 should be infinite and there should be continuity between
terminals 1 and 2.
4. Continuing to rotate time knob until a second click is heard should restore
circuit between terminals 1 and 4.
Valve, water Controls water flow to the ice maker and
cavity.
Check resistance across coil windings.
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