Hoshizaki KM-900MRF IV. Service Diagnosis No ICE Production, Problem Possible Cause Remedy

IV. SERVICE DIAGNOSIS

1. NO ICE PRODUCTION

PROBLEM	POSSIBLE CAUSE						REMEDY
[1] The icemaker	a) Power Supply	1.			“OFF” position.	1.	Move to “ON” position
will not start		2.			Loose connections.	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 out.	1. Check for short circuit
	Disconnect, if any)						and 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.			Tripped with bin filled	1.	Remove ice.
	Thermostat				with ice.
				2. Ambient temperature		2. Increase ambient
					too cool.		temperature.
		3.			Set too warm.	3.	See “II.2.[d]
							CONTROLS AND
							ADJUSTMENTS, 5) Bin
							Control.”
		4.			Bulb out of position.	4.	Place in position.
		5.			Bad contacts or leaks	5.	Check for continuity and
					bulb.		replace.
	e) High Pressure	1.			Bad contacts.	1.	Check for continuity and
	Control						replace.
	f) Transformer	1.			Thermal fuse blown out	1. Replace.
					or coil winding opened.
	g) Wiring to	1.			Loose connections or	1.	Check for continuity and
	Controller Board				open.		replace.
	h) Thermistor	1.			Leads short-circuit or	1.	See “II.2.[d] CONTROLS
					open and High		AND ADJUSTMENTS, 1)
					Temperature Safety		Defrost Control.”
					operates.
	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	1.	Check and get
					water supply cycle does		recommended pressure.
					not 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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