Hoshizaki KM-201BWH, KM-260BAH, KM-201BAH, KM-260BWH service manual Evaporator Is Frozen Up

3. EVAPORATOR IS FROZEN UP

PROBLEM	POSSIBLE CAUSE				REMEDY
[1] Freeze cycle	a) Float Switch	1.	Leads shorted or	1.	Check and replace.
time is too			defective switch.
long.		2.	Float does not move	2.	Clean or replace.
			freely.
	b) Inlet Water Valve	1.	Diaphragm does not	1.	Check for water leaks
			close.		with icemaker off.
					Replace if necessary.
	c) Control Board	1.	Defective.	1.	See “II. 3. [d] CONTROL
					BOARD CHECK
					PROCEDURE”.
[2] All ice formed	a) Evaporator	1.	Scaled up.	1.	Clean.
on Evaporator	b) Water Supply Line	1.	Water pressure too low.	1.	Check and get
does not fall					recommended pressure.
into bin in	c) Inlet Water Valve	1.	Dirty mesh filter or	1.	Clean.
harvest cycle.			orifice.
		2.	Diaphragm does not	2.	Check for water leaks
			close.		with icemaker off.
					Replace if necessary.
	d) Ambient and/or	1.	Too cool.	1.	Increase temperature.
	water temperature
	e) Thermistor	1.	Out of position or loose	1.	See “V. 17.
			attachment.		THERMISTOR”.
	f) Control Board	1.	Harvest timer is set too	1.	Adjust longer, referring to
			short.		“II. 4. THERMISTOR”.
		2.	Defective.	2.	See “II. 3. [d] CONTROL
					BOARD CHECK
					PROCEDURE”.
[3] Others	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	1.	Coil winding opened.	1.	Replace.
	Valve	2.	Plunger does not move.	2.	Replace.
		3.	Wiring to hot gas valve.	3.	Check for loose
					connection or open, and
					replace.
	f) Water Supply Line	1.	Too small; requires 9.5	1.	Increase water supply line
			mm OD line dedicated		size.
			per machine.
	g) Water Filter	1.	Flow rate too small.	1.	Replace with filter that
					has larger flow rate.

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