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
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