Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 83

7130 (EF): Incompatible unit combination error
Abnormal points and detection methods
The connected indoor unit is not compatible with the out-
door unit, the outdoor unit detects the error at startup.
Diagnosis of failure
Refer to the service manual of the outdoor unit or
the connected indoor unit for the authorized
combination.
Is the indoor unit authorized to
connect with the outdoor unit?
Check whether the model selection
switches are set correctly.
Are they correct?
OCH790 _83
No
Yes
No
Yes
Causes and checkpoints
Connecting indoor unit(s) which is not authorized to con-
nect to the outdoor unit.
Replace the indoor unit(s) to the connectable
one.
Set the model selection switches correctly, then
restart.
Replace the outdoor multi controller circuit
board.