Hoshizaki MRH KM-901MAH, MWH No Ice Production - Possible Cause, Freeze-Up - Possible Cause

No Ice Production - Possible Cause

15. Thermistor	a) Loose, disconnected, or defective.
See "II.F. Thermistor Check"
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	a) Dirty.
Guides
	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	a) Dirty, sticking.
See "II.E. Float Switch Check
	b) Defective.
and Cleaning"
7. Refrigerant Charge	a) Low.
8. Control Board	a) Harvest timer (S4 dip switch 1 & 2) set too short.
See "III.C. Settings and	b) Harvest pump timer (S4 dip switch 7) not in factory default position
Adjustments" and "II.C. Control
	("G" control board).
Board Check"
	c) Defective.
9. Bin Control	a) Actuator does not move freely.
See "II.D. Bin Control Check"
10. Thermistor	a) Loose, disconnected, or defective.
See "II.F. Thermistor Check"

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