Hoshizaki KM-900MWF, KM-900MRF3, KM-900MAF service manual Problem, Possible Cause, Remedy

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.
will not start		2.	Bad contacts.	2.	Check and replace.
or operates	b) High Pressure	1.	Dirty Air Filter or	1.	Clean.
intermittently.	Control		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.”
	j) Discharge Temp.	1. Refrigerant		1. Recharge.
	Switch		undercharged.
		2.	Cooling Fan not operating.	2. See chart 1 - [6]

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