Daikin RZQ Series FCQ20EVA Service Manual page 165

SiME281501E
CHECK 4
Check for Power Transistor
Judgement according to the continuity check by using an analog tester:
(1)Do not touch the charged area (high voltage) for 10 minutes after turning the power supply OFF.
(2)If you must touch such an area, make sure that the power supply voltage of power transistor is 50 V or
less.
(3) Disconnect the connector of the outdoor unit fan motor.
When the outdoor unit fan is rotating against a strong wind, the heat exchanger is charged and electric
shock may result. Therefore, disconnect the connector from the outdoor unit fan motor after confirming
that the outdoor unit fan has stopped.
(4)Before measuring the continuity, disconnect the connection between compressor and power transistor.
(5)Measure the continuity in the following procedure.
[Judgement] Normal if the continuity check results in the following.
Power transistor (on inverter PCB)
Note:
 If there is continuity, the resistance should be the same as each phase.
 If a digital tester is used for the measurement of continuity,  and continuity may be reversed.
Service Diagnosis
C+ — U Continuity
C+ — V Continuity
C+ — W Continuity
U — C+
V — C+
W — C+
Troubleshooting by Remote Controller
C- — U
C- — V
C- — W
U — C- Continuity
V — C- Continuity
W — C- Continuity
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