Hoshizaki KM-301BAJ, Service Manual

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H. Diagnostic Tables
1. No Ice Production
No Ice Production - Possible Cause
1. Power Supply a) Off, blown fuse, or tripped breaker.
b) Unplugged or loose connection.
b) Not within specifications.
2. Fuse (Control Box) a) Blown.
3. Control Switch a) In "OFF" or "SERVICE" position.
b) Bad contacts.
4. High-Pressure Switch a) Dirty condenser.
b) Fan motor not operating.
c) Refrigerant overcharged.
d) Bad contacts.
e) Refrigerant lines or components plugged.
f) HGV defective.
5. Control Transformer
(115VAC/10.5VAC)
a) Coil winding open or shorted.
6. Control Board
See "II.C. Control Board Check"
a) In alarm.
b) CB "POWER OK" LED flashing (bin full).
c) Defective.
7. Bin Control
See "II.D. Bin Control Check"
a) Tripped with bin filled with ice.
b) Actuator does not move freely.
c) Defective.
8. Water Supply a) Water supply off or improper water pressure.
b) External water filters clogged.
9. Inlet Water Valve a) Screen or orifice clogged.
b) Coil winding open.
c) Water valve open in freeze cycle.
10. Float Switch
See "II.E. Float Switch Check
and Cleaning"
a) Float does not move freely.
b) Defective.
11. Compressor a) Compressor relay contacts bad or coil winding open.
b) Start capacitor defective.
c) External protector open.
d) Start relay contacts bad or coil winding open.
e) Compressor defective.
12. Hot Gas Valve a) Closed in harvest cycle.
b) Open in freeze cycle.
13. Thermistor
See "II.F. Thermistor Check"
a) Loose, disconnected, or defective.
14. Pump Motor a) Motor winding open.
b) Bearing worn out or locked rotor.
c) Defective capacitor.
d) Mechanical seal worn out.