SiUS122226E Check
Part 6 Service Diagnosis 237
8.14 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.
2/3/4MXS, 2/3MXL(H)
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 k ~ several M
Resistance is NG. 0 or
(R24593)
DC–
DC+
W
V
U
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