Diagnostic Tables - Hoshizaki KM-350MWJ Service Manual

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