Power Module Check - Daikin CTXG09QVJUW Service Manual
Multi-split type air conditioners 2/3/4mxs-n series
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SiUS121630EA
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.
Positive terminal (+) of digital
multimeter
Negative terminal (–) of digital
multimeter
Resistance is OK.
Resistance is NG.
Service Diagnosis
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.
DC–
DC+
U
Power module
UVW
(+)
UVW
Power module
(+)
several kΩ ~ several MΩ
V
W
Power module
(–)
UVW
Power module
0 Ω or ∞
(R24593)
Check
UVW
(–)
201
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