Hoshizaki AMERICA 73183 - Manual (Page 31)

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3b. Defrost: Control Module with Integrated Display
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. Compressor Relay a) Defective.
3. 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.