Hoshizaki KM-1300SRH3, KM-1300SAH3 Evaporator is Frozen Up, Problem, Possible Cause, Remedy

2. 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 close.	1.	Check for water leaks with
						icemaker off.
	c)	Controller Board	1.	Defective.	1.	See "II.2[e] 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 low.	1.	Check and get
fall into bin in harvest						recommended pressure.
cycle.
	c)	Water Filter System	1.	Dirty/Restricted	1.	Replace filter.
	d)	Water Solenoid Valve	1.	Dirty mesh filter or orifice.	1.	Clean.
			2.	Diaphragm does not close.	2.	Check for water leaks with
						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 loose	1.	See "V.11. Removal and
				attachment.		Replacement of
						Thermistor."
	h)	Controller Board	1.	Defrost timer is set too	1.	Adjust longer, referring to
				short.		"II.2.[d] Controls and
						Adjustments, 2) Defrost
						Timer."
			2.	Defective.	2.	See "II.2[e] 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	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 1/2"	1.	Increase water line size.
				OD line dedicated per
				machine.
	g)	Water Filter	1.	Flow rate too small.	1.	Replace with filter that has
						larger flow rate.

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