Hoshizaki KM-320MAH, KM-320MWH service manual Problem Possible Cause Remedy

Problem	Possible Cause		Remedy
	c) Controller Board	1. Defective.	1. See "II.B.5. Checking the
			Controller Board."
[2]All ice formed on	a)Evaporator	1. Scaled up.	1. Clean.
evaporator does not
	b)Water Supply Line	1. Water pressure too	1. Check and get
fall into bin in harvest
cycle.		low.	recommended pressure.
	c) Water Filter System	1. Dirty/Restricted	1. Replace filter.
	d)Water Solenoid Valve	1. Dirty mesh filter or	1. Clean.
		orifice.
		2. Diaphragm does not	2. Check for water leaks with
		close.	icemaker off.
	e) Ambient and/or water	1. Too cool.	1. Increase temperature.
	temperature.
	f) Line Valve	1. Continues to open in	1. Check operation in harvest
		harvest cycle.	cycle and replace.
	g)Thermistor	1. Out of position or	1. See "V.H. Removal
		loose attachment.	and Replacement of
			Thermistor."
	h)Controller Board	1. Defrost timer is set	1. Adjust longer, referring
		too short.	to "II.B.4. Controls and
			Adjustments, b) Defrost
			Timer.
		2. Defective.	2. See "II.B.5. Checking the
			Controller Board."
[3]Other	a)Spray Tubes	1. Clogged.	1. Clean
		2. Out of position.	2. Place in position.
	b)Water System	1. Dirty.	1. Clean.
	c) Refrigerant	1. Undercharged.	1. Check for leaks and
			recharge.
	d)Expansion Valve	1. Bulb out of position or	1. Place in position.
		loose attachment.
		2. Defective.	2. Replace.
	e)Hot Gas Solenoid Valve	1. Coil winding opened.	1. Replace.
		2. Plunger does not	2. Replace.
		move.
		3. Wiring to hot gas	3. Check for loose
		valve.	connection or open, and
			replace.
	f) Water Supply Line	1. Too small; requires	1. Increase water line size.
		3/8" OD line dedicated
		per machine.
	g)Water Filter (if installed)	1. Flow rate too small.	1. Replace with filter that has
			larger flow rate.

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