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Only for training and service purposes
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3.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two causes.
The one is called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
Unit runs but poor cooling or heating.
Ineffective Cooling or Heating
Check of outdoor coil
(heat exchanger) & the fan
operation
Check gas leakage.
Repair gas leak.
Replacement of unit if the
unit is beyond repair.
Satisfactory operation with
temperature difference of
inlet & outlet air ;
COOLING : 7~10
°
C
HEATING : 15~17
°
C
Check heat load increase in
cooling operation.
Unexpected residue
Added heat load
Check of inside gas
pressure
Adjusting of refrigerant
charge
Malfunction of compressor
Replacement of
compressor
Check of cold (warm) air cir-
culation for smooth flowing
Dirty indoor coil
(Heat exchanger)
Malfunction of fan
Clogged of air filter
Obstruction at air outlet
Countermeasure against
above trouble.
Check clogging in refrigera-
tion circuit.
Repair clogging in refrigera-
tion circuit.
