Daikin FVXS25FV1B Service Manual page 155

Check
50 class
Tester's negative terminal Power transistor
Tester's positive terminal
Normal resistance
Abnormal resistance
144
Checking the power transistor
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
If unavoidably necessary to touch a live part, make sure the power transistor's supply
voltage is below 50 V using the tester.
For the UVW, make measurements at the Faston terminal on the board or the relay
connector.
UVW
(+)
Power transistor
UVW
(+)
Several kΩ to several MΩ
W V
Power transistor
(–)
Power transistor
UVW
0 or ∞
U
Service Diagnosis
SiBE06-708
UVW
(–)
(R5237)