Daikin ERQ Service Manual page 246

Method of Replacing the Inverter's Power Transistors Modules
Power module checking
When using the digital type of multiple tester, make measurement in diode check mode.
Tester terminal
+
C+
U
V
W
U
V
W
C-
The following abnormalities are also doubted besides the PC board abnormality.
• Faulty compressor (ground fault, ground leakage)
• Faulty fan motor (ground leakage)
236
Criterion
-
U Not less than 0.3V
(including ∞ )*
V
W
C- Not less than 0.3V
(including ∞ )*
C+ 0.3 to 0.7V
(including ∞ )*
U 0.3 to 0.7V
(including ∞ )*
V
W
*There needs to be none of each value variation.
: http://splitoff.ru/tehn-doc.html
ESIE09-05
Remark
It may take time to
determine the voltage
due to capacitor
charge or else.
Appendix