Hoshizaki Steelheart Series Service Manual page 21

1b. Appliance Not Cooling - Cabinet Area
Appliance Not Cooling - Cabinet Area - Possible Cause
1. Power Supply
2. Power Cord and Plug
3. Wiring
4. Cabinet Control Module
See "III.D. Alarm Safeties."
Cabinet Thermistor
5.
Cabinet Fan Motor
6.
Cabinet Fan Motor Relay
7.
Doors/Drawers/Gaskets
8.
2. Evaporator is Frozen Up - Possible Cause
Evaporator is Frozen Up
Evaporator
1.
Evaporator Fan Motor
2.
Rail Control Module
3.
Rail Light Sensor
4.
Refrigerant Charge/Refrigerant
5.
Lines
Defrost Heater
6.
Defrost Safety Thermostat
7.
Doors/Drawers/Gaskets
8.
3. Defrost Fails to Initiate or Terminate - Possible Cause
Defrost Fails to Initiate
Rail Control Module
1.
Defrost Fails to Terminate
Defrost Thermistor
1.
(Confirm DTh status. See "II.C.
Thermistor Check.")
Rail Control Module
2.
a) Unplugged, blown fuse, or tripped or defective circuit breaker.
b) Loose connection.
c) Not within specifications.
a) Loose connection.
b) Defective.
a) Loose connection or open.
b) Faulty.
a) Loose connection.
b) In alarm.
c) Defective.
a) Loose, disconnected, or defective.
a) Loose connection.
b) Defective.
c) Cabinet Control Module defective.
a) Loose connection.
b) Defective.
a) Open/Not sealing.
a) Dirty.
a) Defective.
b) Fan blade binding.
c) Defrost thermistor defective.
d) Rail control module defective.
a) Defective. 6-hr. defrost timer or 4-hr. continuous compressor run
timer fails to initiate defrost.
a) Incorrect position.
b) Defective. Stuck in day mode while rail lids closed (Night mode).
a) Low.
b) Component restriction (cap tube, drier).
a) Defective.
a) Defective.
a) Open/Not sealing.
a) Defective.
a) Defective.
a) Defective.
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