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5-3-3. Only compressor does not run
Check compressor motor
capacitor (CA, CB)
Measure resistance of
compressor motor winding
Measure power supply voltage
The voltage is too low
5-3-4. Compressor and outdoor fan do not run
Float switch turned ON
YES
Check if drain pump
runs normaly
YES
Verify if drain condensate tube
is obstructed
YES
Remove obstruction
Overload relay is working
(OLR 1 to 4)
Temperature of compressor
is abnormally high
YES
Refrigerant gas shortage
NO
NO
Rotor may be locked up
NO
Replace the drain pump
22
YES
YES
Measure coil resistance of
power relay (PRA, PRB)
Charge refrigerant gas
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