SG-38MARB-01                                                                            Specifications subject to change without notice.                     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
YES
NO
NO
Turn o 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?
Problem solved.
Replace the electric control box.