Hoshizaki IM-500SAB Service Manual page 19

Low Ice Production - Possible Cause
1. Evaporator
2. Control Board
3. Evaporator (Cube Control)
Thermistor
See "II.E. Evaporator Thermistor
Check"
4. Hot Gas Valve
5. Compressor
6. Thermostatic Expansion Valve
7. Refrigerant Charge
1. Evaporator
2. Hot Gas Valve
3. Condenser
4. Control Board
5. Thermostatic Expansion Valve
6. Compressor
7. Refrigerant Charge
Slab Does Not Break Into Separate Cubes - Possible Cause
1. Spring
2. Water Plate
Cubes Drop Separately - Possible Cause
1. Refrigerant Charge
2. Cam Arm
Imperfect Ice Production - Possible Cause
1. Water Supply
2. Inlet Water Valve
3. Water Plate
4. Pump Motor
Long Harvest Cycle
a) Scaled up.
a) Thermistor connection loose (K3).
b) Defective.
a) Loose, disconnected, or defective.
a) Erratic or closed.
a) Inefficient or off.
a) Defective.
a) Low.
Long Freeze Cycle
a) Scaled up, dirty.
a) Defective.
a) Restricted.
a) Defective.
a) Bulb loose.
b) Defective.
a) Inefficient or off.
a) Low.
a) Over-extended.
a) Obstacle caught between evaporator and water plate.
a) Low - Long harvest cycle.
a) Worn out.
a) Improper water pressure.
b) External water filters restricted.
c) Water leaks from water tank or water plate due to broken tank or
plate or icemaker out of level.
a) Water leaks from valve body or water supply pipe joint.
a) Spray holes restricted.
a) Defective.
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