MXS Service Manual

Check SiUS121736EA
219 Service Diagnosis
8.15 Power Module Check
Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is about
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 (+) or (–) terminal of the power
module and the U, V or W terminal of the compressor with a multimeter. Evaluate the
measurement results referring to the following table.
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 ∞
(R24593)
DC–
DC+
WVU