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Table 9 – Troubleshooting Chart
SYMPTOM CAUSE REMEDY
Compressor and condenser fan will not start.
Power failure Call power company
Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker
Defectivecontactor, transformer, or high--pressure,
loss--of--charge or low --pressure switch
Replace component
Insufficient line voltage Determine cause and correct
Incorrect or faul ty wiring Check wiring diagram and rewire correctly
Thermostat setting too high
Lower thermos tat setting below room tempera-
ture
Compressor will not start but condenser fan
runs
Faulty wiring or loose connections in compressor cir-
cuit
Check wiring and repair or replace
Compressor motor burned out, seized, or Determine cause
internal overload open Replace compressor
Defectiverun/start capacitor, overload, start relay Determine cause and replace
One leg of 3--phas e power dead
Replace fuse or reset circuit breaker
Determine cause
Three--phasescroll compressor
Scroll compressor is rotating in the wrongdirection
Correct the direction of rotation by revers ing the
3--phase power leads to the unit.
makes excessive noise, an d there may be a
low pressure differential.
Compressor cycles (otherthan normally sat-
isfying thermostat).
Refrigerant overcharge or undercharge
Recover refrigerant, evacuate system, and re-
chargeto capacities shown on rating plate
Defectivecompressor Replace and determine cause
Insufficient line voltage Determine cause and correct
Blocked condenser Determine cause and correct
Defectiverun/start capacitor, overload or start relay Determine cause and replace
Defectivethermostat Replace thermos tat
Faulty condenser--fanmotor or capacitor Replace
Restriction in refrigerant system Locate restriction and remove
Compressor operates continuously
Dirt y air filter Replace filter
Unit undersized for load Decreas e l oad or increase unit size
Thermostat set too low Reset thermos tat
Low refrigerant charge Locate leak, repair, and recharge
Mechanical damage in compressor Replace compressor
Air in system
Recover refrigerant, evacuate system, and re-
charge
Condenser coil dirty or restricted Clean coil or remove restriction
Excessive head pressure
Dirt y 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 or air short--cycling Determine cause and correct
Head pressure too low
Low refrigerant charge Check for leaks, r epair, and recharge.
Compressor IPR leaking Replace compressor
Restriction in liquid tube Remove restriction
Excessive suction pressure
High heat load Check for source and eliminate
Compressor IPR leaking Replace compressor
Refrigerant overcharged Recover excess refrigerant
Suction pressure too low
Dirt y air filter Replace filter
Low refrigerant charge Check for leaks, r epair and recharge
Metering device or low side restricted Remove source of restriction
Insufficient evaporator airflow
Increase air quantity
Check filter–replace if necessary
Temperature too low in conditioned area Reset thermos tat
Outdoor ambient below 55°F (12.7°C) Install low--ambient kit
Filter drier restr icted Replace filter
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