Carrier 42LUVH025N - Key Parts Checking

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9.2.10 P4(inverter compressor drive error) diagnosis and solution.
9.3 Key parts checking.
9.3.1. Compressor checking
Model: DA108X1C-20FZ3
Measure the resistance value of each winding by using the multi-meter.
Model:
DA130S1C-20FZ
Measure the resistance value of each winding by using the multi-meter.
Position
Resistance Value
Blue - Red
0.71Ω
(20Ԩ
)
Blue - Black
Red - Blue
Position
Resistance Value
Blue - Red
0.
95Ω
(2
0
Ԩ
)
Blue - Black
Red - Blue
Is the connection of
compressor good? Is
the wiring sequence
Replace the outdoor
If the problem comes
to again, check coil
resistance of inverter
YES
Replace inverter
Reconnect and retry
NO
NO