62 PB
TROUBLESHOOTING
Compressor Fault Isolation
Judging the connecting terminals of inverter compressor:
It is impossible to identify terminals U, V and W of inverter compressor with multi-meter. Just connect the terminals in the same way as the
original unit when replacing the compressor. A wrong connection will lead to reverse and loud noise of the compressor.
Resistance of compressor coil:
Using an OHM Meter, check resistance from U to V, U to W, and V to W. All of the readings should be within 0.1 ohms of each other. A difference of
more than 0.1 ohms indicates that windings may be damaged, and the compressor should be replaced. NOTE: Actual OHM values may vary due to
temperature of the compressor.
Electric Filter Board Fault Isolation
Visual examination: as the circuit is simple, the connection may be checked visually to see whether any loose or poor connection.
Voltage test: the voltage at the input end shall be the same as the voltage at the output end.
Electrical Communication Fault ISOLATION
1. Determine whether the connecting cables and tether cables of indoor/outdoor units are correctly wired. If not, change wiring order and test
connection.
2. Determine whether there is loose connection.
Fasten the connection in the case of loose connection and then conduct verication.
3. Measure the voltage between SI and N with multi-meter and see whether the voltage uctuates between 0 VDC and 24 VDC.
Replace indoor and outdoor control boards if there are no voltage uctuations.
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