Diagnostic Charts; No Ice Production - Hoshizaki KM-1601SAH/3 Service Manual

G. Diagnostic Charts
Before consulting the diagnostic charts, check for correct installation, proper voltage per
unit nameplate, and adequate water supply. Check the control board using the steps in
"IV.B. Control Board Check." Check the dip switch settings to assure that S4 dip switch 3, 4,
7, 8, 9, 10 and S5 (KM-1601SAH/3 "G" CB) dip switch 1 through 5 are in the factory default
position. S4 dip switch 1, 2, 5, 6 are cleaning adjustments and the settings are flexible. For
factory default settings, see "II.C.3.a) Default Dip Switch Settings."

1. No Ice Production

No Ice Production - Possible Cause
1. Power Supply
2. Main Transformer (230V/115V)
(3 Phase Only)
3. Water Supply
4. Interlock Switch (Cleaning
Valve)
5. Thermostatic Bin Control
See "IV.C. Bin Control Check."
6. Fuse (Control Box)
7. Control Switch
8. High-Pressure Switch
9. Control Transformer
(115V/10.5V)
10. Control Board
See "IV.B. Control Board Check."
11. Thermistor
See "IV.E. Thermistor Check."
12. Hot Gas Valve
a) Off, blown fuse, or tripped breaker.
b) Not within specifications.
a) Coil winding open or shorted.
a) Water supply off or improper water pressure.
b) External water filters clogged.
a) Open position.
b) Bad contacts.
a) Tripped with bin filled with ice.
b) Ambient temperature too cool.
c) Set too warm.
d) Bulb out of position.
e) Bad contacts.
a) Blown.
a) Bad contacts.
a) Bad contacts.
b) Dirty air filter (air-cooled models).
c) Clogged condenser.
d) Ambient temperature too warm.
e) Refrigerant overcharged.
f) Fan not operating (air-cooled and remote air-cooled models).
g) Refrigerant lines or components plugged.
h) Headmaster (C.P.R.) open (remote air-cooled models).
i) Condenser water temperature too warm (water-cooled models).
j) Insufficient water supply to condenser (water-cooled models).
k) Water regulating valve out of adjustment or defective (water-cooled
models).
l) Condenser water temperature too warm.
a) Coil winding open or shorted.
a) In alarm.
b) Defective.
a) Leads shorted or open.
a) Open in freeze cycle.
b) Closed in harvest cycle.
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