Payne PA1Z030 Installation, Start-Up And Service Instructions Manual page 18

TROUBLESHOOTING COOLING CHART
SYMPTOM CAUSE REMEDY
Compressor and con- Power failure Call power company.
denser fan will not Fuse btown or circuit breaker tripped Replace fuse or reset circuit breaker.
start.
Defective thermostat, contactor, transformer, Replace component.
or control retay
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. Compressor motor burned out, seized, or Determine cause. Replace compressor.
internal overload open
Defective run/start capacitor, overload, Determine cause and replace.
or 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). 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 filter Replace filter.
continuously. 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 filter Replace filter.
pressure. 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. Compressor valves leaking Replace compressor.
Refrigerant overcharged Recover excess refrigerant.
Suction pressure too Dirty air filter Replace filter.
low. Low refrigerant charge Check for leaks, repair, and recharge.
Metering device or Iow side restricted Remove source of restriction.
Insufficient evaporator airflow Increase air quantity. Check filter -- replace if
necessary. Check for other evaporator coil obstructions.
Temperature too low in conditioned area Reset thermostat.
Outdoor ambient below 40 F Install low-ambient kit.
Field-installed filter-drier restricted Replace.
Copyright 1997 Carrier Corporation CATALOG NO 53PA-1Z0