Power Module Check - Daikin FTXM-K Series Service Manual

SiBE041434E

5.13 Power Module Check

Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is
approximately 0 V before checking.
Positive terminal (+) of
digital multimeter
Negative terminal (–) of
digital multimeter
Resistance is OK.
Resistance is NG.
20/25/35 class
DC +
Power module (+)
DC –
Power module (–)
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.
Power module UVW
(+)
UVW Power module
(+)
several kΩ ~ several MΩ
Power module
(–)
UVW Power module
0 Ω or ∞
V
U
(R20794)
Check
UVW
(–)
W
106