Service Manual

18
2. Evaporator is Frozen Up
Evaporator is Frozen Up - Possible Cause
1.
Evaporator
a)
Dirty.
2.
Evaporator Fan Motor
a)
Defective.
b) Fan blade binding.
c) Defrost thermistor defective.
d) Control module defective.
3.
Defrost Thermistor
a)
Out of position or defective.
4.
Control Module
a)
Defective.
5.
Refrigerant Charge/Refrigerant
Lines
a)
Low.
b)
Component restriction (cap tube, drier).
6.
Defrost Heater
a)
Defective.
7.
Defrost Timer
a)
Defective.
8.
Defrost Safety Thermostat
a)
Defective.
3. Defrost Fails to Initiate or Terminate
Defrost Fails to Initiate - Possible Cause
1.
Defrost Thermistor (Conrm
DTh status. See "II.C.
Thermistor Check.")
a)
Evaporator temperature 39°F (3.8°C) or lower not achieved.
See "1. Appliance Not Cooling."
b)
Out of position or defective.
2.
Control Module
a)
Defective.
Defrost Fails to Terminate - Possible Cause
1.
Defrost Thermistor (Conrm
DTh status. See "II.C.
Thermistor Check.")
a)
Evaporator temperature 41°F (5°C) not achieved.
b)
Defective.
2.
Defrost Heater
a)
Defrost safety thermostat defective.
b)
Defective.
3.
Control Module
a)
Defective.