Service Guide

36
2. Evaporator Frozen Up
Evaporator Frozen Up - Possible Cause
1.
Evaporator
a)
Dirty.
2.
Evaporator Fan Motor
a)
Fan blades binding.
b)
Defective.
3.
Defrost Thermistor
a)
Out of position or defective.
4.
Control Module
a)
Defective.
5. Compressor Relay a) Defective.
6.
Refrigerant Charge/Refrigerant
Lines
a)
Low.
b)
Component restriction (TXV, cap tube, drier).
7.
Defrost Heater (freezer)
a)
Defective.
3. Defrost
Refrigerator Defrost Fails to Initiate - Possible Cause
1. Control Module (2-hr. defrost timer) a) Defective.
Refrigerator Defrost Fails to Terminate - Possible Cause
1. Defrost Thermistor (Conrm DTh
status. See "II.D. Thermistor Check.")
a) Defrost termination temperature 40°F (4.7°C) F-6 and Earlier or 44°F
(6.6°C) F-7 and Later not achieved.
b) Defective.
2. Control Module a) Defrost thermistor connection loose.
b) Defective.
3. Compressor Relay a) Defective.
Freezer Defrost Fails to Initiate - Possible Cause
1.
4-hr. (Auxiliary Code F-7 and earlier)
or 5-hr. (Auxiliary Code: F-8 and
later) compressor cumulative run
time defrost timer terminated.
a)
Check compressor operation. See "1. Not Cooling."
2.
Control Module
a)
Defective.
3.
Defrost Thermostat
a) Open. Cut-out: 120°F
±5°F (49°C±3°C), Cut-in: 70°F±5°F
(21C±3°C)
Freezer Defrost Fails to Terminate - Possible Cause
1.
Defrost Heater
a)
Defrost thermostat open.
b)
Defective.
2.
Defrost Thermistor (Conrm DTh
status. See "II.D. Thermistor Check.")
a)
Defrost termination temperature 59°F (15°C) F-7 and Earlier or 45°F
(7.2°C) F-8 and Later not achieved.
b)
Defrost thermistor connection loose.
3.
Control Module
a)
Defective.
4.
Compressor Relay
a)
Defective.