A P0 error code is caused when an abnormal voltage signal is sent to the compressor. This can be caused by a faulty outdoor board, outdoor fan or a compressor malfunction.
For a more detailed diagnostics, you can review the attached PDF - P0_P4 error code on how to pinpoint the issue. Please refer to the other attachments for the specific tests mentioned in the error code procedure.
Board Test PDF
P0/P4 Error Code
E3/F5 Error Code PDF
IMP Continuity Check PDF
Compressor Checking PDF
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