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No Ice Production - Possible Cause
14. Hot Gas Valve
a) Closed in harvest cycle.
b) Open in freeze cycle.
15. Thermistor
See "II.F. Thermistor Check"
a) Loose, disconnected, or defective.
16. Pump Motor
a) Motor winding open.
b) Bearing worn out or locked rotor.
c) Defective capacitor.
d) Mechanical seal worn out.
17. Thermostatic Expansion Valve
a) Bulb loose.
b) Operating erratically.
18. Liquid Line Valve
a) Closed in freeze cycle.
b) Open in harvest cycle.
19. Fan Motor
a) Motor winding open.
b) Bearing worn out or locked rotor.
c) Defective capacitor.
20. Water System
a) Water leaks causing short freeze time.
2. Freeze-Up
Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist.
See the Hoshizaki America Technician's Pocket Guide or contact your local distributor for a
copy of the freeze-up checklist.
Freeze-Up - Possible Cause
Harvest Cycle
1. Evaporator
a) Scaled up.
b) Damaged.
2. Cube Guides
a) Out of position.
b) Damaged.
3. Spray Tubes and/or Spray
Guides
a) Dirty.
b) Out of position.
4. Water Supply
a) Low water pressure.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) copper
water tubing or equivalent.
5. Inlet Water Valve
a) Screen or orifice clogged.
b) Defective.
6. Float Switch
See "II.E. Float Switch Check
and Cleaning"
a) Dirty, sticking.
b) Defective.
7. Refrigerant Charge
a) Low.
8. Control Board
See "III.C. Settings and
Adjustments" and "II.C. Control
Board Check"
a) Harvest timer (S4 dip switch 1 & 2) set too short.
b) Harvest pump timer (S4 dip switch 7) not in factory default position
("G" control board).
c) Defective.
