Basic Air Conditioning Trouble Shooting Checklist - nVent Hoffman SpectraCool Slim Fit Instruction Manual

7. Carefully check the compressor for proper operation - motor should cause slight vibration and the
outer case of the compressor should be warm. Is the compressor showing signs of this?
YES, wait 5 minutes, proceed to step 9.
NO, possible problem:
» Defective start or run capacitor
» Defective overload
» Defective start relay
» Defective contactor
» Defective compressor
8. Make sure the coils are clean then check the evaporator air in and air out temperatures. If the
temperatures are the same:
» Possible loss of refrigerant
» Possible bad valves in compressor

BASIC AIR CONDITIONING TROUBLE SHOOTING CHECKLIST

SYMPTOM
Unit won't cool
Compressor tries to start but won't run
Unit blows breakers
Getting water in enclosure
For additional support, refer to NVent Cooling Sales and Service Contacts on page 4.
C-NET INDUSTRIAL LTD. | +44(0)121 544 8608 | INFO@CNET-IS.CO.UK | WWW.CNET-IS.CO.UK
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Clogged �� o n coil(s)
Dir����
Impeller(s) not running
Compressor not running
Compressor runs, but has bad valves
Loss of refrigerant
Low line voltage at start. Should be +/-10% rated voltage.
Compressor motor stuck
Bad contactor
Bad overload switch
Bad run/start capacitor
Undersized breaker/fuse or not time delayed
Short in system
Drain plugged
Drain tube kinked
Enclosure not sealed (allowing humidity in)
Mounting gasket damaged
Repair or Replace
defective part
Repair or Replace
defective part
POSSIBLE CAUSE
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