Daikin E-Series Service Manual page 422

SiAU18-715
Troubleshooting
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 C-
V
W
U C+
V
W
C- U
V
W
The following abnormalities are also doubted besides the PC board abnormality.
Faulty compressor (ground fault, ground leakage)
Faulty fan motor (ground leakage)
Criterion Remark
Not less than 0.3V It may take time to
(including ∞)*
determine the
voltage
due to capacitor
charge or else.
Not less than 0.3V
(including ∞)*
0.3 to 0.7V
(including ∞)*
0.3 to 0.7V
(including ∞)*
*There needs to be none of each value variation.
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