Hoshizaki KM-1300MRH, KM-1300MWH, KM-1300MAH service manual Controller Board

PROBLEM	POSSIBLE CAUSE					REMEDY
	l) Controller Board	1.		Defective	1.	See "II.2[e] CHECKING
						CONTROLLER BOARD."
	m) Interlock Switch	1.		“OFF” position.	1.	Move to “ON” position.
	(Cleaning Valve)		2.	Bad contacts.	2.	Check for continuity and
						replace.
[2] Water	a) Float switch	1.		Connector disconnected.	1.	Place in position.
continues to			2.	Leads opened or defective	2.	Check and replace.
be supplied,				switch.
and the ice-		3.		Float does not move freely.	3.	Clean or replace.
maker will not	b) Controller Board	1.		Defective.	1.	Replace.
start.
[3] Compressor	a) Wash Switch	1.		“WASH” position.	1.	Move to “ICE” position.
		2.		Bad contacts.	2.	Check and replace.
	b) High Pressure	1.		Dirty Air Filter or	1.	Clean.
	Controller			Condenser.
			2. Ambient or condenser		2. Reduce ambient temp.
				water temp. too warm.
			3. Refrigerant overcharged.		3.	Recharge.
			4. Condenser water pressure		4.	Check and get
				too low or off. [Water-		recommended pressure.
				cooled model only].
		5.		Fan not operating. [Except	5.	See chart 1 - [6].
				water-cooled model].
		6.		Refrigerant line or	6.	Clean and replace Drier.
				components plugged.
	c) Water Regulator	1.		Set too high.	1.	Adjust lower.
	d) Overload Protector	1.		Bad contacts.	1.	Check for continuity and
						replace.
		2.		Voltage too low.	2.	Increase voltage.
		3.		Refrigerant overcharged or	3. Recharge.
				undercharged.
		4.		Line Valve continues to	4.	Check Line Valve’s
				close in freeze cycle and		operation in freeze cycle
				Overload Protector		and replace.
				operates.
	e) Starter	1.		Bad contacts.	1.	Check and replace.
		2.		Coil winding opened.	2.	Replace.
	f) Start Capacitor or	1.		Defective.	1.	Replace.
	Run Capacitor
	g) Magnetic Contactor	1.		Bad contacts.	1.	Check for continuity and
						replace.
		2.		Coil winding opened.	2.	Replace.
	h) Compressor	1.		Wiring to Compressor.	1.	Check for loose
						connection or open, and
						replace.
		2.		Defective.	2.	Replace.
		3.		Protector tripped.	3.	Reduce temperature.
	i) Controller board	1.		Defective.	1.	See “II.2. [e] CHECKING
						CONTROLLER BOARD.”
[4] Water	a) Water Solenoid	1.		Diaphragm does not close.	1.	Check for water leaks
continues to	Valve					with icemaker off.
be supplied in	b) Controller Board	1.		Defective.	1.	See “II.2.[e] CHECKING
freeze cycle.						CONTROLLER BOARD.”

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