Hoshizaki KM-901MAJ Service Manual page 31

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