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Table 7—Troubleshooting Chart
SYMPTOM CAUSE REMEDY
Compressor and outdoorfan
will not start
Power failure Call power company
Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker
Defectivecontactor, transformer, control relay, defrost
board, or high--pressure, loss--
of--charge or low--pressure switch
Replace component
Insufficient line voltage Determine cause andcorrect
Incorrect or faulty wiring C heck wiring diagram and rewire correctly
User Interface setting too low/too high ResetUIsetting
DO NOT bypass this compressor time
delay–wait for 5 minutes until time--delay
relay is de--energized
Units have a 5--minute ti medelay
Compressor will not start but condenser fan
runs
Faulty wiring or circuit
Loose connections in compressor
Check wiring and repair or replace
Compressor motor burned out, seized, or Determine cause
internal overload open R eplace compressor
Defective run capacitor, overload, or PTC (positive
temperature coefficient) thermistor
Determine cause andreplace
One leg of 3--phase power dead
Replace fuse or reset circuit breaker
Determine cause
Low input voltage (20 percent low) Determine cause and correct
Three--phase scroll compressor (size 030--
Scroll compressor is rotating in the wrong direction
Correct the direction ofrotation by reversing the
060 unit) has a low pressure differential 3--phase power leads to the unit
Compressor cycles(other than normally satis-
fying) cooling/heating calls
Refrigerant overcharge or undercharge
Recover refrigerant, evacuatesystem,andre-
chargeto capacities shown on rating plate
Defectivecompressor Replace and determine cause
Insufficient line voltage Determine cause andcorrect
Blocked outdoor coil Determine cause andcorrect
Defectiverun/start capacitor, overload or startrelay Determine cause and replace
Faulty outdoor fan motor or capacitor Replace
Damaged reversing valve Determine cause andcorrect
Restriction in refrigerantsystem Locate restriction and remove
Compressor operates continuously
Dirty air filter Replace filter
Unit undersized for load Decrease load or i ncrease unit size
UI temperature set toolow/too high ResetUIsetting
Low refrigerant charge Locate leak, repair, and recharge
Frosted coil with incorrect defrost operation
Check defrost time settings
Reset as necessary
Check defrost temperature switch
Replace as necessary
Air in system
Recover refrigerant, evacuatesystem,andre-
charge
Outdoor coi ldirty or restricted Cleancoil or removerestriction
Excessive head pressure
Dirty air filter Replace filter
Dirty indoor or outdoor coil Clean coil
Refrigerant overcharged Recoverexcess refrigerant
Air in system
Recover refrigerant, evacuatesystem,andre-
charge
(Heat) Indoor air restricted or recirculating Determine cause andcorrect
Indoor or outdoor air restricted or air short--cycling Determine cause andcorrect
(Continued next pag e)
50CR