Outdoor Unit Protects; Indoor Unit Communication Error - Midea MSE-09CRN1-BQ8W Service Manual

11.9 Outdoor unit protects

Check if the power supply is good
Change outdoor PCB and check if the error is still exit

11.10 Indoor unit communication error.

Check the if the signal wire is well connection
Change indoor PCB and check if the error is still exit
Outdoor PCB failure, change outdoor PCB
Yes
Yes
Compressor failure
Yes
Yes
Service manual
Connect the signal wire well or change the
signal wire if it's the problem of the wires.
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No
Power supply failure
No
Outdoor PCB failure
No
No
Indoor PCB failure