Hoshizaki DCM-750BAH-OS, DCM-750BWH-OS service manual Problem Possible Cause Remedy

Problem	Possible Cause		Remedy
[3] Ice purge cycle will	a) Water Control Relay	1. Low water safety	1. Replace.
not start.		circuit open
		(bad contacts ).
	b) Control Switch	1. Bad contacts.	1. Check for continuity and
			replace.
	c) Bin Control	1. Open.	1. Bin full, check for
			continuity on proximity
			switch.
	d) Control Board	1. Fails to operate gear	1. See "II.D.4. Control Board
		motor relay.	Check Procedure."
	e) Gear Motor Fuse	1. Blown.	1. Check gear motor
			amperage, bearing
			wear (see "V.F.1. Upper
			Bearing Wear Check"),
			and supply voltage.
	f) Gear Motor Thermal	1. Open.	1. Check gear motor
	Protector		bearings, supply voltage.
	g) Gear Motor	1. Open windings.	1. Replace.
		2. Auger coupling broke.	2. Replace.
		3. Locked bearings.	3. Replace.
[4] Freeze cycle will not	a) Gear Motor Protect	1. Open coil.	1. Replace.
start (compressor).	Relay	2. Open contacts.	2. Replace.
	b) Control Board	1. Defective.	1. See "II.D.4. Control Board
			Check Procedure."
	c) Starter (Start Relay)	1. Bad contacts.	1. Check for continuity and
			replace.
		2. Coil winding open.	2. Replace.
		3. Loose connections.	3. Tighten.
	d) Start Capacitor or Run	1. Defective.	1. Replace.
	Capacitor
	e) Compressor	1. Power supply not	1. Refer to nameplate and
		within specifications.	correct.
		2. Wiring to compressor.	2. Check for loose or open
			connection, repair or
			replace.
		3. Defective.	3. Replace.
		4. Compressor locked	4. Replace.
		and internal motor
		protector tripped.
[5] All components	a) Refrigerant	1. Low charge.	1. See "V.B. Service for
run, but no ice is			Refrigerant Lines."
produced.
		2. Refrigerant line or	2. Remove the restriction or
		component restricted.	component and replace
			the drier.
		3. Air or moisture	3. Recover refrigerant,
		trapped.	replace drier, evacuate,
			and recharge.
	b) Expansion Valve	1. Bulb loose.	1. Secure bulb.
		2. Operating erratically.	2. Check and replace.
	c) Compressor	1. Defective.	1. Replace.

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