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By means of diagnostic flow chart:
Generally, there are two kinds of problems, i.e. starting failure and insufficient cooling/heating. “Starting failure”
is caused by electrical defect while improper application or defects in refrigerant circuit causes “Insufficient
cooling / heating”.
i) Diagnosis of Electric Circuit
The most common causes of air conditioner failure to “start” are :
a) Voltage not within ±10% of rated voltage.
b) Power supply interrupted.
c) Improper control settings.
d) Air conditioner is disconnected from main power source.
e) Fuse blown or circuit breaker off.
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