Service Manual

Check SiUS071735E
109 Service Diagnosis
5.13 Power Module Check
Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is approximately
0 V before checking.
 Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
 Follow the procedure below to measure resistance between the terminals of the power module
and the terminals of the compressor with a multimeter. Evaluate the measurement results
referring to the following table.
09/12 class
Positive terminal (+) of
digital multimeter
Power module
(+)
UVW Power module
(–)
UVW
Negative terminal (–) of
digital multimeter
UVW Power module
(+)
UVW Power module
(–)
Resistance is OK. several kΩ ~ several MΩ
Resistance is NG. 0 Ω or ∞
Pin 24: +
Pin 23: U
Pin 22: V
Pin 21: W
Pin 20: –
(R20703)