Carrier DHMVHA Service Manual page 36

:
DIAGNOSIS AND SOLUTION (CONT.)
Communication Error Between the Outdoor Main Chip and Compressor (PC40)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
PC40
The main chip cannot detect the compressor driven chip
Outdoor PCB
Electric control box
Shut off the power supply and
turn it on 2 minutes later.
Is it still displaying
the error code?
Replace the outdoor
main board.
Does the system
function normally?
NO
Replace the electric control box.
NO
Problem is solved.
YES
36