Hoshizaki HUR68A(-D), HWR40A(-D), HUR96A(-D) Diagnosis Chart, Problem Possible Cause Remedy

B. Diagnosis Chart

Problem		Possible Cause		Remedy
[1]	Compressor will	a)Power Supply	1. "OFF" position.	1. Move to "ON" position.
	not start—no		2. Loose connection(s).	2. Tighten or reconnect.
	current draw.
			3. Failure.	3. Call electrician.
		b) Cord and Plug	1. Defective.	1. Replace.
		c) Circuit Breaker	1. Tripped.	1. Check and reset. Call
		(kitchen)		electrician if breaker trips
				repeatedly.
			2. Defective.	2. Call electrician.
		d)Transformer	1. Open coil winding.	1. Check continuity and replace.
		e)Wiring to Control Board	1. Loose connection(s).	1. Tighten.
			2. Faulty.	2. Check continuity and replace.
		f) Voltage	1. Too low.	1. Call electrician.
			2. Too high.	2. Call electrician.
		g)High Pressure Switch	1. Bad contacts.	1. Check continuity and replace.
			2. Has operated 5 or	2. Determine why pressure
			more times in one	switch is activated.
			hour. (E4 should be
			displayed)
		h)Thermistor	1. Defective.	1. Check and replace.
		i) Control Board	1. Defective.	1. Replace control board.
		j) Compressor Overload	1. Defective. (Contacts	1. Replace.
			open)
		k) Compressor	1. Open windings.	1. Check continuity and replace.
		l) Relay (Condensing	1. Bad contacts.	1. Replace.
		Unit)	2. Open coil winding.	2. Check and replace.
[2]	Compressor will	a)Voltage	1. Too low.	1. Call electrician.
	not run—draws	b)Start Relay	1. Bad contacts.	1. Replace.
	current and trips
			2. Open coil windings.	2. Replace.
	on overload.
		c) Compressor	1. Locked rotor.	1. Replace.
		d)Start Capacitor	1. Defective.	1. Check and replace.
[3]	Compressor runs	a)Voltage	1. Too low.	1. Call electrician.
	intermittently and		2. Too high.	2. Call electrician.
	trips on overload.
		b)Condenser Filter	1. Clogged.	1. Clean filter.
		c) Refrigerant Line or	1. Plugged or restricted.	1. Clean and replace drier. Clean
		Component		and replace capillary tube heat
				exchanger assembly.
		d)Condenser Fan Motor	1. Failed.	1. Replace.
		e)Refrigerant	1. Overcharged.	1. Evacuate and recharge.
			2. Non-condensibles in	2. Evacuate and recharge.
			system.
		f) Location of Unit	1. Restricted air flow to	1. Move unit or increase
			condenser.	ventilation.
[4]	Cabinet	a)Thermistor	1. Defective.	1. Check and replace.
	temperature too	b)Compressor Relay	1. Defective.	1. Check and replace.
	high; compressor
		c) Control Board	1. Defective.	1. Replace.
	will not start.

42