Hoshizaki KM-901MWH, KM-901MAH, KM-901MRH/3 service manual Abnormal Ice

Problem	Possible Cause		Remedy
[1] Freeze cycle time is	n) Control Board	1. Float switch	1. Check and reconnect.
long. (continued)		connection loose (K5).
		2. Defective.	2. See "IV.B. Control Board
			Check."
[2] Harvest cycle time is	a) Water Supply	1. Water temperature too	1. Increase temperature.
long.		cold.
	b) Thermistor	1. Disconnected, loose,	1. Connect, secure, check.
		or defective.	See "V.L. Removal
			and Replacement of
			Thermistor" and "IV.E.
			Thermistor Check."
	c) Control Board	1. Not reading	1. Check and replace. See
		thermistor.	"IV.E. Thermistor Check."
		2. Sending voltage to	2. Check and replace. See
		liquid line valve (if	"IV.B. Control Board
		applicable) in harvest.	Check."
	d) Inlet Water Valve	1. Clogged.	1. Clean or replace.
	e) Evaporator	1. Scaled up.	1. Clean.
		2. Damaged.	2. Replace.
	f) Hot Gas Valve	1. Does not open, or	1. Check and replace.
		opens partially.
	g) Expansion Valve	1. Wide open in harvest.	1. Check and replace.
		2. Bulb loose.	2. Secure bulb.
	h) Water Regulating Valve	1. Open during harvest.	1. Adjust or replace. See
	(water-cooled model)		"V.J. Adjustment of Water
			Regulating Valve."
	i) Liquid Line Valve (if	1. Open during harvest	1. Check and replace.
	applicable)	cycle.

4. Abnormal Ice

Problem	Possible Cause		Remedy
[1] Small cubes.	a) Pump-Out Check Valve	1. Dirty or worn and	1. Clean or replace.
		leaking by.
	b) Ice Cube Guide	1. Out of position.	1. Place in position.
		Circulated water falls
		into bin.
	c) Water System	1. Water supply line too	1. Increase water line size.
		small; requires 3/8"
		OD line dedicated per
		machine.
		2. Water filter clogged or	2. Replace filter or install a
		flow rate too small.	higher flow rate filter.
	d) Inlet Water Valve	1. Dirty mesh filter or	1. Clean.
		orifice.
	e) Pump Motor	1. RPM too slow.	1. See chart 1.[5].
	f) Control Board	1. Defective.	1. See "IV.B. Control Board
			Check."

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