Carrier DHMVHA - Outdoor Communication Faults; Outdoor Chip;Compressor Communication Error (PC40)

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DIAGNOSIS AND SOLUTION (CONT.)
Communication Error Between the Outdoor Main Chip and Compressor (PC40)
Troubleshooting
Error Code PC40
Malfunction decision conditions The main chip cannot detect the compressor driven chip
Supposed causes
Outdoor PCB
Electric control box
Replace the electric control box.
Problem is solved.
YES
Shut o the power supply and
turn it on 2 minutes later.
Is it still displaying
the error code?
NO
Replace the outdoor
main board.
Does the system
function normally?
NO