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Compressor operation
Replacement
control PCB
Normal
NO
NO
NO
YES
YES
YES
Is the power
transistor module
cracked or burnt?
Is there a
short circuit between the
power transistor module
terminals?
❇
1
Is the balance
between the compressor
current phases good?
If there is a 10% or greater difference
in the current in different phases.
(except during acceleration or deceleration)
Power transistor module (including drive circuit) check method
❇
1 Power transistor module terminal short circuit check procedure
Disconnect the compressor wiring, then conduct a short circuit check.
P-U, P-V, P-W
N-U, N-V, N-W
Check between the P-N terminals.
Bring the tester probes in contact with the following places on each terminal.
P: Power transistor P terminal, U: End of red harness to compressor
N: Power transistor N terminal, V: End of white harness to compressor
W: End of black harness to compressor