Daikin FTXG20LV1BW, Service Manual

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Check SiBE041401E
101 Service Diagnosis
5.13 Power Module Check
Check No.22
Note: Check to make sure that the voltage between (+) and (–) of the diode bridge or the power
module is approximately 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
diode bridge or 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.
20/25/35 class
Negative (–) terminal of multimeter
(positive terminal (+) for digital
multimeter) Diode
bridge (+)
or
Power module
(+)
UVW Diode
bridge (–)
or
Power module
(–)
UVW
Positive (+) terminal of multimeter
(negative terminal (–) for digital
multimeter) UVW Power module (+)
or
Diode
bridge (+)
UVW Power module
(–)
or
Diode
bridge (–)
Resistance is OK. several k
Ω
~ several M
Ω
Resistance is NG. 0
Ω
or
∞
(R19947)
Diode bridge