Hoshizaki AMERICA 73183 - Manual (Page 30)

30
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.
8. Defrost Thermostat Open (freezer) a) Defective.
3a. Defrost: Control Module with Remote Display Module
Refrigerator Defrost Fails to Initiate - Possible Cause
1. Defrost Thermistor (Confirm
DTh status. See "II.D. Thermistor
Check.")
a) Defrost initiation temperature 8.6°F (-13°C) not achieved. See "1. Not
Cooling."
b) Out of position or defective.
2. Control Module a) Defective.
Refrigerator Defrost Fails to Terminate - Possible Cause
1. Defrost Thermistor (Confirm
DTh status. See "II.D. Thermistor
Check.")
a) Defrost termination temperature 40°F (4.4°C) not achieved.
b) Defective.
2. Compressor Relay a) Defective.
3. Control Module a) Defrost thermistor connection loose.
b) Defective.
Freezer Defrost Fails to Initiate - Possible Cause
1. Defrost Thermistor (Confirm
DTh status. See "II.D. Thermistor
Check.")
a) Defrost initiation temperature 32°F (0°C) not achieved. See "1. Not
Cooling."
b) Out of position or defective.
2. Compressor 4-hr. cumulative run
timer not satisfied.
a) Check compressor operation. See "1. Not Cooling."
3. Control Module a) Defective.
Freezer Defrost Fails to Terminate - Possible Cause
1. Defrost Thermistor (Confirm
DTh status. See "II.D. Thermistor
Check.")
a) Defrost termination temperature 59°F (15°C) not achieved.
b) Defrost thermistor connection loose.
2. Defrost Heater a) Defrost thermostat defective.
b) Defective.
3. Compressor Relay a) Defective.
4. Control Module a) Defective.