Diagnostic Tables - Hoshizaki KM-320MAH Service Manual

G. Diagnostic Tables
1. No Ice Production
No Ice Production - Possible Cause
1. Power Supply
2. Main Transformer
(208-230/60/1 Models with main
transformer and all 208-230/60/3
Models)
3. Fuse (Control Box)
4. Thermostatic Bin Control
See "II.D. Bin Control Check"
5. Control Switch
6. High-Pressure Switch
7. Control Transformer
(115VAC/10.5VAC)
8. Control Board
See "II.C. Control Board Check"
9. Mechanical Bin Control
See "II.D. Bin Control Check"
10. Water Supply
11. Inlet Water Valve
12. Float Switch
See "II.E. Float Switch Check
and Cleaning"
13. Compressor
a) Off, blown fuse, or tripped breaker.
b) Not within specifications.
a) Voltage tap switch not set to proper voltage.
b) Coil winding open or shorted.
a) Blown.
a) Tripped with bin filled with ice.
b) Ambient temperature too cool.
c) Set too warm.
d) Bulb out of position.
e) Open contacts, defective.
a) In "OFF" or "WASH" position.
b) Bad contacts.
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) Yellow "BC OPEN" LED on (bin full) ("G" control board).
c) Defective.
a) Tripped with bin filled with ice.
b) Actuator does not move freely.
c) 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.
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