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3. Defrost
UR/WR Defrost - Possible Cause
1. Control Module (fails to initiate)
See "II.C. Control Module Check"
2. Control Module (fails to terminate)
See "II.C. Control Module Check"
3. Defrost Thermistor (Confirm DTh
status. See "II.D. Thermistor Check")
SR and UF/WF Defrost - Possible Cause
1. Control Module (fails to initiate)
See "II.C. Control Module Check"
2. Defrost Safety Thermostat
3. Defrost Heater
4. Defrost Thermistor (Confirm DTh
status. See "II.D. Thermistor Check")
5. Control Module (fails to terminate)
See "II.C. Control Module Check"
a) Defective-Cumulative 5-hr. defrost timer fails.
b) Defective-1-hr. defrost lock-out timer fails.
a) Defrost thermistor connection loose.
b) Defective.
a) Defective.
a) Defective (Cumulative 5-hr. defrost timer fails).
a) Defective. Open. Cut-out: 120°F±5°F (49°C±3°C), Cut-in: 70°F±5°F
(21°C±3°C).
a) Defrost safety thermostat open.
b) Defective.
a) Defective.
a) Defrost thermistor connection loose.
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