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SYMPTOM
Compressor and condenser fan will
not start.
Compressor will not start but
condenser fan runs
Compressor cycles (other than
normally satisfying thermostat).
Compressor operates continuously
Excessive head pressure
Head pressure too low
Excessive suction pressure
Suction pressure too low
Table 8—Troubleshooting Chart
CAUSE
Power failure
Fuse blown or circuit breaker tripped
Defective contactor, transformer, or high--
pressure, loss--of--charge or low--pressure
switch
Insufficient line voltage
Incorrect or faulty wiring
Thermostat setting too high
Faulty wiring or loose connections in com-
pressor circuit
Compressor motor burned out, seized, or
internal overload open
Defective run/start capacitor, overload,
start relay
Refrigerant overcharge or undercharge
Defective compressor
Insufficient line voltage
Blocked condenser
Defective run/start capacitor, overload or
start relay
Defective thermostat
Faulty condenser--fan motor or capacitor
Restriction in refrigerant system
Dirty air filter
Unit undersized for load
Thermostat set too low
Low refrigerant charge
Mechanical damage in compressor
Air in system
Condenser coil dirty or restricted
Dirty air filter
Dirty condenser coil
Refrigerant overcharged
Air in system
Condenser air restricted or air short--cycl-
ing
Low refrigerant charge
Compressor IPR leaking
Restriction in liquid tube
High heat load
Compressor IPR leaking
Refrigerant overcharged
Dirty air filter
Low refrigerant charge
Metering device or low side restricted
Insufficient evaporator airflow
Temperature too low in conditioned area
Outdoor ambient below 55°F (12.7°C)
Filter drier restricted
REMEDY
Call power company
Replace fuse or reset circuit breaker
Replace component
Determine cause and correct
Check wiring diagram and rewire cor-
rectly
Lower thermostat setting below room
temperature
Check wiring and repair or replace
Determine cause
Replace compressor
Determine cause and replace
Recover refrigerant, evacuate system,
and recharge to capacities shown on
rating plate
Replace and determine cause
Determine cause and correct
Determine cause and correct
Determine cause and replace
Replace thermostat
Replace
Locate restriction and remove
Replace filter
Decrease load or increase unit size
Reset thermostat
Locate leak, repair, and recharge
Replace compressor
Recover refrigerant, evacuate system,
and recharge
Clean coil or remove restriction
Replace filter
Clean coil
Recover excess refrigerant
Recover refrigerant, evacuate system,
and recharge
Determine cause and correct
Check for leaks, repair, and recharge.
Replace compressor
Remove restriction
Check for source and eliminate
Replace compressor
Recover excess refrigerant
Replace filter
Check for leaks, repair and recharge
Remove source of restriction
Increase air quantity
Check filter–replace if necessary
Reset thermostat
Install low--ambient kit
Replace filter
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