Midea MOX630U-55HFN8-RRD0WGA - PC 40(Communication Error between Outdoor Main PCB and IPM Board Diagnosis and Solution)

Troubleshooting
 Page 73 
8.13 PC 40(Communication error between outdoor main PCB and IPM board diagnosis and
solution)
Description: The main PCB cannot detect the IPM board.
Recommended parts to prepare:
• Connection wires
• IPM board
• Outdoor main PCB
• Electric control box
Troubleshooting and repair:
Is there at least one LED in
the IPM board light?
Is there at least one LED in
the IPM board light?
Check the signal wire between
the IPM board and the main
board, is it connected properly?
Check the signal wire between
the IPM board and the main
board, is it connected properly?
Reconnect and retry. Is the
error still displayed?
Reconnect and retry. Is the
error still displayed?
Replace IPM board. Is the
system running normally?
Replace IPM board. Is the
system running normally?
Replace the electric control
box
Replace the electric control
box
No
No
No
No
Yes
Trouble is resolved
Trouble is resolved
No
Yes
Replace outdoor main board.
Is the system running
normally?
Replace outdoor main board.
Is the system running
normally?
No
Yes
Yes