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Table 9 – Troubleshooting Chart
SYMPTOM CAUSE REMEDY
Compressor and condenser fan will notstart.
Power failure Call power company
Fuse blown or circuit breaker tripped Replace fuse o r reset circuit breaker
Defective contactor, transformer,or high--pressure,
loss-- of-- charge or low-- pressureswitch
Replace component
Insufficient line voltage Determine cause and correct
Incorrect or faulty wiring Check wiring diagram and rewi re correctly
Thermostat setting toohigh
Lower thermostat 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 repl ace
Compressor motor burned out, seized, or Determine cause
internal overload open Replace compressor
Defective run/start capacitor, overload, start relay Determine cause and replace
One leg of3--phase power dead
Replace fuse or reset circuit breaker
Determine cause
Three--phase scroll compressor
Scroll compressor is rotating i nthe wrong direction
Correct the direction of rotationby reversing the
3--phase power leads tothe unit.
makes excessive noise, and there may bea
low pressure differential.
Compressor cycles (other than normally sat-
isfying thermostat).
Refrigerant overcharge or undercharge
Recover refrigerant, evacuate system,andre-
charge tocapacities shown onrating plate
Defective compressor 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 orcapacitor 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 unitsize
Thermostat set too low Reset thermostat
Low refrigerant charge Locate leak, repair, and r echarge
Mechanical damage in compressor Replace compressor
Air in system
Recover refrigerant, evacuate system,andre-
charge
Condenser coil dirty or restricted Cleancoilor 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,andre-
charge
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 IPRleaking Replace compressor
Restriction inliquid tube Removerestriction
Excessive suction pressure
High heatload Check for source and eliminate
Compressor IPRleaking Replace compressor
Refrigerant overcharged Recover excess refrigerant
Suction pressure too low
Dirty air filter Replace filter
Low refrigerant charge Check for leaks, repair andrecharge
Metering device or l owside restricted Remove sourceof restriction
Insufficient evaporator airflow
Increase air quantity
Check filter–replace if necessary
Temperature too low in conditioned area Reset thermostat
Outdoor ambient bel ow55°F (12.7°C) Install low--ambient kit
Filter drier restricted Replace filter
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