Carrier 38MARBQ12AA1 Service Manual page 55

DIAGNOSIS AND SOLUTION (CONT)
Communication Error Between Outdoor Main Chip and Compressor Driven Chip (PC40)
Description: The main chip cannot detect the compressor driven chip.
Recommended parts to repair:
• Outdoor PCB
• Electric control box
Troubleshooting
SG-38MARB-01
Turn off the power.
Wait 2 minutes then turn back on.
Is it still displaying
the error code.
Replace the outdoor main board.
Can the system
operate normally?
NO
Replace the electric control box.
Specifications subject to change without notice.
NO
Problem solved.
YES
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