Pc40(Communication Malfunction Between Ipm Board And Outdoor Main Board Diagnosis And Solution) - MrCool DIY-MULTI2-18HP230C Service Manual

8.8 PC 40(Communication malfunction between IPM board and outdoor main board
diagnosis and solution)
Description: The main PCB cannot detect the IPM board.
Recommended parts to prepare:
• Connection wires
• Outdoor PCB
• IPM module board
• Electric control box
Troubleshooting and repair:
Communication malfunction between
IPM board and outdoor main board
Is there at least one LED in
the IPM board light?
No
Check the signal wire
between the IPM board and
the main board, is it
connected good?
No
Reconnect and retry. Is error
still display?
No
Replace IPM board, and then
check whether the system
can run normally
No
Replace outdoor main board,
and then check whether the
system can run normally
No
Replace the electric control
box

Yes
Yes
Yes
Yes
Troubleshooting 40
No
Trouble is solved
