Daikin RMXS-L Series Service Manual page 237

SiUS181305E
Power module checking
When using the digital type of multiple tester, make measurement in diode check mode.
Tester terminal
+
C+
U
V
W
U
V
W
C–
The following abnormalities are also doubted besides the PCB abnormality.
h Defective compressor (ground fault, ground leakage)
h Defective fan motor (ground leakage)
Troubleshooting
Method of Replacing Inverter's Power Transistors Modules
Criterion
–
U Not less than 0.3 V
(including )
V
W
C– Not less than 0.3 V
(including )
C+ 0.3 ~ 0.7 V
(including )
U 0.3 ~ 0.7 V
(including )
V
W
There needs to be none of each value variation.
Remark
It may take time to
determine the voltage due
to capacitor charge or else.
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