Indoor Unit Communication Error - Goodman MSG-12CRN1N Service Instructions Manual

TROUBLESHOOTING
Outdoor Unit Fails to Operate:
Check if power supply is good
Change outdoor control board and check if the error still exists

Indoor Unit Communication Error:

Check to see if the signal wire is well connected
Change indoor control board and check if the error still exists
Outdoor control board failure, change outdoor control board
Yes
Yes
Compressor failure
Yes
Yes
No
Power Supply
No
control board failure
No
Connect the signal wire well
or change the signal wire
if it's the problem of the wires.
No
Indoor
control board
failure
failure
Outdoor
25