Check SiUS12-928_B
201 Service Diagnosis
7.15 Power Module Check
Check No.22
Note: Check to make sure that the voltage between (+) and (–) of the power module (PM1) is approx.
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 multi-tester. Evaluate the measurement results
referring to the following table.
18 class
24/32 class
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
Power module (+) UVW Power module (–) UVW
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
UVW Power module (+) UVW Power module (–)
Resistance is OK. several k ~ several M
Resistance is NG. 0 or
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