Filter
Top Products
62
Table 45—Cooling Service Analysis
PROBLEM CAUSE REMEDY
Compressor and Condenser Fan
Will Not Start.
Power failure. Call po wer company.
Fuse bl own or circuit breaker tripped. Replace fuse or reset circuit breaker.
Defective thermostat, contactor, transformer, or
control r elay .
Replace component.
Insufficient line voltage. Determine cause and correct.
Incorrect or faulty wiring. Check wiring diagram andrewire correctly.
Thermostat settingtoo high. Lower thermostat setting below room tempera-
ture.
Compressor Will Not Start
But Condenser Fan R uns.
Faulty wiringor loose connectionsin compres-
sor circuit.
Check wiring and repair or replace.
Compressor motor burned ou t, seized, or in-
ternal overload open.
Determine cause. Replace compressor.
Defective run/start capacitor, overload,start
relay.
Determine cause and replace.
One leg of3- pha se power dead. Replace fuse or reset circuit breaker. Determine
cause.
CompressorCycles(OtherThan
Normally Satisfying Thermostat).
Refrigerant overcharge orundercharge. Recover refrigerant, evacuate system, and re-
charge to nameplate.
Defective c ompressor. Replace and determine cause.
Insufficient line voltage. Determine cause and correct.
Blocked condenser. Determine cause and correct.
Defective run/start capacitor, overload,or start
relay.
Determine cause and replace.
Defective thermostat. Replace thermostat.
Faulty condenser-fan motor or capacitor. Replace.
Restriction in refrigerant system. Locate restriction and remove.
Compressor Operates Continuously.
Dirty air filter. Replace filter.
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. R eplace compressor.
Air in system. Recover refrigerant, evacuate system, and re-
charge.
Condenser coil dirty or restricted. Clean coil or remove restriction.
Excessive Head Pressure.
Dirty air filter. Replace filter.
Dirty condenser coil. Clean coil.
Refrigerant overcharged. Recover excess refrigerant.
Air in system. Recover refrigerant, evacuate system, and re-
charge.
Condenser air restricted orair short-cycling. Determine cause and correct.
Head Pressure Too Low.
Low refrigerant charge. Check for leaks,repair, and recharge.
Compressor valves leaking. Replace compressor.
Restrictioninliquidtube. Remove re striction.
Excessive Suction Pressure.
High heat load. Check for source and eliminate.
Compressor valves leaking. Replace compressor.
Refrigerant overcharged. Recover excess refrigerant.
Suction Pressure Too Low.
Dirty air filter. Replace filter.
Low refrigerant charge. Check for leaks,repair, and recharge.
Metering device or low side restricted. Remove source of restriction.
Insufficient evaporator airflow . Increase air quantity.Check filter and replace if
necessary.
Temperature too low in conditioned area. Reset thermostat.
Outdoor ambient below 25 F. Install low-a mbient kit .
Evaporator Fan Will Not Shut Off.
Time off delay not finished. Wait for 30-second off delay.
48HE,HJ