Hoshizaki KM-901MRH/3, KM-901MWH, KM-901MAH service manual Low Ice Production

Problem	Possible Cause		Remedy
[2]All ice formed on	l) Refrigerant	1. Low charge.	1. Check for leaks. Recover,
evaporator does not			repair, evacuate, and
fall into bin in harvest			recharge.
cycle. (continued)	m)Water Regulating Valve	1. Leaking by in harvest.	1. Check and replace.
	(water-cooled model)
[3]Other.	a) Ice Cube Guide	1. Out of position.	1. Place in position.
	b) Thermostatic Bin	1. Bulb out of position.	1. Place in position.
	Control
		2. Bad contacts.	2. Check for continuity and
			replace. See "IV.C.1.
			Thermostatic Bin Control
			Check."
	c) Mechanical Bin Control	1. Movement restricted.	1. Check and free.
		2. Defective.	2. See "IV.C.2. Mechanical
			Bin Control Check and
			Cleaning."

3. Low Ice Production

Problem	Possible Cause			Remedy
[1] Freeze cycle time is	a) Inlet Water Valve		1. Diaphragm does not	1. Check for water leaks with
long.			close.	icemaker off.
	b) Float Switch		1. Float switch does not	1. Clean or replace. See "IV.
			move freely or switch	D. Float Switch Check and
			defective.	Cleaning."
	c) Evaporator		1. Scaled up.	1. Clean.
			2. Damaged.	2. Replace.
	d) Spray Tubes		1. Dirty.	1. Clean.
			2. Out of position.	2. Place in position.
	e) Pump Motor		1. RPM too slow.	1. See chart 1.[5].
	f)	Condenser (except	1. Air filter or condenser	1. Clean.
		water-cooled model)	clogged.
	g) Refrigerant Charge		1. Low charge.	1. Check for leaks. Recover,
				repair, evacuate, and
				recharge.
	h) Hot Gas Valve		1. Open.	1. Check and replace.
	i)	Expansion Valve	1. Bulb loose.	1. Secure bulb.
			2. Operating erratically.	2. Check and replace.
	j)	Compressor	1. Erratic or off.	1. See chart 1.[3].
	k) Condenser Water		1. Water regulating valve	1. Adjust or replace. See
		(water-cooled model)	set too high.	"V.J. Adjustment of Water
				Regulating Valve."
			2. Condenser water	2. Check and get
			pressure too low.	recommended pressure.
			3. Water temperature out	3. Correct to specification.
			of specification.
	l)	Liquid Line Valve	1. Erratic, sticking.	1. Check and replace.
	m)Headmaster (C.P.R.)		1. Bypassing.	1. Replace.
		(remote condenser
		unit)

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