Hoshizaki DKM-500BAH service manual Low Ice Production, Abnormal Ice

Problem	Possible Cause		Remedy
	d)Expansion Valve	1. Bulb out of position or	1. Place in position.
		loose attachment.
		2. Defective.	2. Replace.
	e)Hot Gas Valve	1. Coil winding opened.	1. Replace.
		2. Plunger does not	2. Replace.
		move.
		3. Wiring to hot gas	3. Check for loose
		valve.	connection or open, and
			replace.
	f) Ice Cube Guide	1. Out of position and ice	1. Place in position.
		trapped.
	g)Water Supply Line	1. Too small; requires	1. Increase water line size.
		3/8" OD line dedicated
		per machine.
	h)Water Filter	1. Flow rate too small.	1. Replace with filter that has
			larger flow rate.
c) Low Ice Production
Problem	Possible Cause		Remedy
[1]Freeze cycle time is	a) See chart 1. a) [3] and check dirty air filter or condenser, ambient or water
long.	temperature, water pressure, and refrigerant charge.
	b) See chart 1. b) [1] and check float switch, inlet water valve and control board.
	c) Check pump, hot gas valve, expansion valve, refrigeration check valve, and
	compressor.
[2]Harvest cycle time is	a) See chart 1. b) [2] and check control board, thermistor, evaporator, ambient
long.	and/or water temperature, water supply line, inlet water valve, and hot gas
	valve.
d) Abnormal Ice
Problem	Possible Cause		Remedy
[1] Small cubes.	a) Ice Cube Guide	1. Out of position.	1. Place in position.
		Circulated water falls
		into bin.
	b) See chart 1. a) [5] and check water supply line, inlet water valve, water system,
	pump motor, and control board.
	c) Drain Valve	1. Dirty.	1. Clean.
[2] Cloudy or irregular	a) See chart 1. b) [1] and 1. b) [3], and check float switch, inlet water valve, control
cubes.	board, spray tubes, water system, refrigerant charge, and expansion valve.
	b) Spray Guide	1. Dirty.	1. Clean.
	c) Water Quality	1. High hardness or	1. Install a water softener or
		contains impurities.	filter.

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