Hoshizaki KM-320MWH, KM-320MAH service manual Evaporator is Frozen Up

Problem	Possible Cause		Remedy
	d)Pump Motor	1. Motor winding opened.	1. Replace.
		2. Bearing worn out.	2. Replace.
		3. Wiring to pump motor.	3. Check for loose
			connection or open, and
			replace.
		4. Defective capacitor.	4. Replace.
		5. Defective or bound	5. Replace and clean.
		impeller.
		6. Mechanical seal worn	6. Check and replace.
		out.
	e)Controller Board	1. Defective.	1. See "II.B.5. Checking the
			Controller Board."
[6] Fan motor will	a)Fan Motor	1. Motor winding opened.	1. Replace.
not start, or is not
		2. Bearing worn out.	2. Replace.
operating.
		3. Wiring to fan motor.	3. Check for loose
			connection or open, and
			replace.
		4. Defective capacitor.	4. Replace.
		5. Fan blade bound.	5. Check and replace.
	b)Controller Board	1. Defective.	1. See "II.B.5. Checking the
			Controller Board."
[7] All components	a)Refrigerant	1. Undercharged.	1. Check for leaks and
run, but no ice is			recharge.
produced.
		2. Air or moisture	2. Replace drier and
		trapped.	recharge.
	b)Compressor	1. Defective valve.	1. Replace.
	c) Hot Gas Solenoid Valve	1. Continues to open in	1. Check and replace.
		freeze cycle.
	d)Line Valve	1. Continues to close in	1. Check and replace.
		freeze cycle.
	e)Water Supply Line	1. Condenser water	1. Check and get
	(water-cooled model)	pressure too low or off	recommended pressure.
		and pressure control
		opens and closes
		frequently.
	f) Water Solenoid Valve	1. Water solenoid valve	1. Check for water leaks with
		is wide open during	icemaker off.
		freeze.

B. Evaporator is Frozen Up

Problem	Possible Cause		Remedy
[1]Freeze cycle time is	a)Float Switch	1. Leads short-circuit or	1. Check and replace.
too long.		defective switch.
		2. Float does not move	2. Clean or replace.
		freely.
	b)Water Solenoid Valve	1. Diaphragm does not	1. Check for water leaks with
		close.	icemaker off.

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