Cornelius UCR 700 Series service manual Troubleshooting Chart - Icemaker Not Operating, Discharge

TROUBLESHOOTING CHART – ICEMAKER NOT OPERATING

NO POWER

Check electrical wiring in con-

trol box for loose connec-

tions.

Check for failed service

switch or relay.

Remote condenser

units only

Remote condenser

not running.

ICEMAKER RUNS BUT DOES NOT MAKE ICE

Condenser fan running but compressor not running

Check line voltage.

Check compressor winding

& components.

LOW WATER SAFETY

SWITCH OPEN

Check that water is turned on.

Check for restriction in water line.

ICEMAKER OPERATING BUT

SOFT ICE

Check bin switch

GEARMOTOR OVERLOAD

TRIPPED

Check water level control and evaporator water tube for lime build up restriction.

Check power to machine.

Check incoming water pressure

(minimum 10 lbs.).

Check water safety switch.

YesNo

No

Yes

			Evaporator water tube
			may have an air bubble.
High pressure	Check electrical	Check power	Clear air bubble from			Clean all related	Refer to guide
switch open or	wiring in control box	to condenser.				drain lines.	to Good Ice in
			tube.
cycling on and off.	for loose connections.			High suction pressure	Low suction pressure		service manual.
				(30 lbs. or above).	(20 lbs. or below).

CAUTION

Clear ice from evaporator and auger before re- setting over- load.

CLEAN

see

instructions.

23

Discharge			Non-condensible	Too much			Condenser	Condenser
king valve			in system.	refrigerant in			fan not		dirty or
partially				system.			running.	restricted.
closed.
			Evacuate and		Check electrical circuit
Open			recharge system.				to fan motor.
valve			Clean condenser.			Check fan motor.
	Low pressure switch open
		or cycling on and off.

Head

Pressure

high.

Valve stuck open.

Replace

valve.

TXV not operating properly.

Bulb loose.

Clean and tighten.

Suction line

not

insulated.

Bulb

uninsulated.

Clean and insulate.

TXV bulb lost charge.

Replace valve evacuate and recharge.

IMPORTANT

Icemaker runs when reset but problem has not been found.

Continue checking for overload as follows to guard against future problems

Icemaker runs

Short run trips again in 2 min- utes. Check gear- motor circuit.

Reset

overload.

Reset but	Will not
motor does	reset.
not run.
Check	Overload
gearmotor	hot try
circuit.	again.
	Will not
	reset
	replace
	overload

Low on	Remote condenser	Plugged	Restricted
				Plugged or	Icemaker
refrigerant.	units only	liquid line	liquid line.	faulty TXV.	froze up.
		dryer.

Check for

leaks.

LAC not operating properly (minimum discharge pressure 180 lbs.).

Replace LAC valve, evacuate and recharge system.

Replace dryer.

Evacuate and recharge system.

Check for

kinks or damage to liquid line.

Replace

valve. Evacuate and recharge system.

Check if auger is turning.

No

OVERLOAD GUIDE ELECTRICAL

High or low voltage weak power lines can cause overloads on icemaker restarts High running current. Check motor circuits and start relay – Auger delay failed.

ICEMAKER

Mechanical parts worn. Scored evaporator or auger. Worn thrust bearing. Ice maker not turning off. Failed ice level control.

Over compression. Low water inlet temperature. Restriction in water line from reservoir.

REFRIGERANT

Contaminated charge or bad compressor. Low charge or gas leak.

Low suction pressure. Improper expansion valve sensing bulb. Location or insulation and/or defective expansion valve

630460154

Check drive on	Check gears in	Check if extruding
gearmotor.	gearbox.	head is down in
		evaporator tube.