Hoshizaki KMD-900MWH IV. Service Diagnosis No Ice Production, Problem Possible Cause Remedy

IV. Service Diagnosis

1. No Ice Production

Problem	Possible Cause				Remedy
[1] The icemaker will not	a) Power Supply		1.	OFF position.	1.	Move to ON position.
start.
			2.	Loose connection.	2.	Tighten.
			3.	Bad contacts.	3.	Check for continuity and
						replace.
			4.	Voltage too high.	4.	Check and get
						recommended voltage.
	b)	Fuse (Inside fused	1.	Blown.	1.	Check for short circuit and
		disconnect, if any)				replace.
	c) Control Switch		1.	OFF position.	1.	Move to ICE position.
			2.	Bad contacts.	2.	Check for continuity and
						replace.
	d)	Bin Control			1.	See "II.3.[c]
						Troubleshooting."
	e)	High Pressure Control	1.	Bad contacts.	1.	Check for continuity and
						replace.
	f)	Transformer	1.	Thermal fuse blown or coil	1.	Replace.
				winding opened.
	g)	Wiring to Controller	1.	Loose connections or	1.	Check for continuity and
		Board		open.		replace.
	h)	Thermistor	1.	Leads short-circuit or open	1.	See "II.2.[d] Controls and
				and high temperature		Adjustments, 1) Defrost
				safety operates.		Control."
	i)	Hot Gas Solenoid	1.	Continues to open in	1.	Check for power off in
		Valve		freeze cycle and high		freeze cycle and replace.
				temperature safety
				operates.
	j)	Water Supply Line	1.	Water supply off and water	1.	Check and get
				supply cycle does not		recommended pressure.
				finish.
			2.	Condenser water pressure	2.	Check and get
				too low or off and pressure		recommended pressure.
				control opens and closes
				frequently to finally
				operate high temperature
				safety.
	k)	Water Solenoid	1.	Mesh filter or orifice gets	1.	Clean.
				clogged and water supply
				cycle does not finish.
			2.	Coil winding opened.	2.	Replace.
			3.	Wiring to water valve.	3.	Check for loose
						connection or open, and
						replace.

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