Hoshizaki KM-81BAJ Service Manual page 29

No Ice Production - Possible Cause
15. Thermostatic Expansion Valve
(KM-161 B_J Models)
16. Fan Motor
17. Water System
2. Freeze-Up
Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist.
See "II.I. 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.E. Float Switch Check
and Cleaning"
7. Refrigerant Charge
8. Control Board
See "III.C. Settings and
Adjustments" and "II.C. Control
Board Check"
9. Bin Control
See "II.D. Bin Control Check"
10. Thermistor
See "II.F. Thermistor Check"
11. Thermostatic Expansion Valve
(KM-161 B_J Models)
12. Hot Gas Valve
a) Bulb loose.
b) Operating erratically.
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 (S1 dip switch 1 & 2) set too short.
b) Harvest pump timer (S1 dip switch 7) not in factory default position.
c) Defective.
a) Actuator does not move freely.
a) Loose, disconnected, or defective.
a) Defective.
a) Closed or restricted.
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