Hoshizaki MODULAR CUBELET SERENITY SERIES FS-1022MLH-C - Manual (Page 39)

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No Ice Production - Possible Cause
Ice Purge Cycle Continued
3. Gear Motor Protect Relay a) Open windings.
b) Contacts stuck open.
Freeze Cycle
1. Gear Motor Protect Relay a) Open.
2. Control Board a) No power to pump-down solenoid valve.
b) X1 relay defective.
3. Pump-Down Solenoid Valve a) Open coil.
b) Sticking.
4. Magnetic Contactor a) Open coil.
b) Contacts sticking.
5. Control Low-Pressure Switch a) Refrigerant pressure too low.
b) Out of adjustment or defective.
6. Safety Low-Pressure Switch
(manual reset)
a) Refrigerant pressure too low.
b) Defective.
7. High-Pressure Switch a) Dirty condenser.
b) Ambient temperature too warm.
c) Fan motor not operating.
d) Refrigerant overcharged.
e) Bad contacts.
f) Refrigerant lines or components restricted.
8. Condensing Unit Fan Motor a) Magnetic contactor contacts bad or coil winding open.
b) Motor winding open.
c) Bearing worn out or locked rotor.
d) Capacitor defective.
9. Compressor a) Magnetic contactor contacts bad or coil winding open.
b) Motor winding open.
c) Start capacitor or run capacitor defective.
d) Start relay contacts bad or coil winding open.
10. Evaporator a) Dirty.
b) Damaged or defective.
11. Expansion Valve (TXV) a) Bulb loose.
b) Operating erratically.
12. Refrigerant Charge a) Low.
13. Drain Valve a) Dirty, leaking by.
b) Defective coil.
c) Defective control board.
14. Water System a) Water leaks.
Refill
1. Float Switch a) Dirty/sticking.
b) Defective.
2. Inlet Water Valve a) Clogged or defective.
3. Water Supply a) Off.