Cooling Troubleshooting Chart, Symptom Cause Remedy

COOLING TROUBLESHOOTING CHART

SYMPTOM	CAUSE	REMEDY
Compressor and con-	Power failure	Call power company.
denser fan will not
denser fan will not	Fuse blown or circuit breaker tripped	Replace fuse or reset circuit breaker.
start.	Fuse blown or circuit breaker tripped	Replace fuse or reset circuit breaker.
start.	Defective thermostat, contactor, transformer,	Replace component.
	Defective thermostat, contactor, transformer,	Replace component.
	or control relay
	Insufficient line voltage	Determine cause and correct.
	Incorrect or faulty wiring	Check wiring diagram and rewire correctly.
	Thermostat setting too high	Lower thermostat setting below room temperature.
Compressor will not	Faulty wiring or loose connections in	Check wiring and repair or replace.
start but condenser	compressor circuit
fan runs.
fan runs.	Compressor motor burned out, seized, or	Determine cause. Replace compressor.
	internal overload open
	Defective run/start capacitor, overload, or	Determine cause and replace.
	start relay
	One leg of 3-phase power dead	Replace fuse or reset circuit breaker.
		Determine cause.
Compressor cycles	Refrigerant overcharge or undercharge	Recover refrigerant, evacuate system, and recharge
(other than normally		to capacities shown on nameplate.
satisfying thermostat).
satisfying thermostat).	Defective compressor	Replace and determine cause.
	Defective compressor	Replace and determine cause.
	Insufficient line voltage	Determine cause and correct.
	Blocked condenser	Determine cause and correct.
	Defective run/start capacitor, overload,	Determine cause and replace.
	or start relay
	Defective thermostat	Replace thermostat.
	Faulty condenser-fan motor or capacitor	Replace.
	Restriction in refrigerant system	Locate restriction and remove.
Compressor operates	Dirty air ®lter	Replace ®lter.
continuously.
continuously.	Unit undersized for load	Decrease load or increase unit size.
	Unit undersized for load	Decrease load or increase unit size.
	Thermostat set too low	Reset thermostat.
	Low refrigerant charge	Locate leak, repair, and recharge.
	Leaking valves in compressor	Replace compressor.
	Air in system	Recover refrigerant, evacuate system, and recharge.
	Condenser coil dirty or restricted	Clean coil or remove restriction.
Excessive head	Dirty air ®lter	Replace ®lter.
pressure.	Dirty condenser coil	Clean coil.
	Dirty condenser coil	Clean coil.
	Refrigerant overcharged	Recover excess refrigerant.
	Air in system	Recover refrigerant, evacuate system, and recharge.
	Condenser air restricted or air short-cycling	Determine cause and correct.
Head pressure too low.	Low refrigerant charge	Check for leaks, repair and recharge.
	Compressor valves leaking	Replace compressor.
	Restriction in liquid tube	Remove restriction.
Excessive suction	High heat load	Check for source and eliminate.
pressure.
pressure.	Compressor valves leaking	Replace compressor.
	Compressor valves leaking	Replace compressor.
	Refrigerant overcharged	Recover excess refrigerant.
Suction pressure too	Dirty air ®lter	Replace ®lter.
low.	Low refrigerant charge	Check for leaks, repair, and recharge.
	Low refrigerant charge	Check for leaks, repair, and recharge.
	Metering device or low side restricted	Remove source of restriction.
	Insufficient evaporator air¯ow	Increase air quantity. Check ®lter, and replace if
		necessary.
	Temperature too low in conditioned area	Reset thermostat.
	Outdoor ambient below 40 F	Install low-ambient kit.
	Field-installed ®lter-drier restricted	Replace.

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764A specifications

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COOLING TROUBLESHOOTING CHART

SYMPTOM

CAUSE

REMEDY

start.

fan runs.

satisfying thermostat).

continuously.

pressure.

Head pressure too low.

low.

764A specifications