Mitsubishi Electric PUMY-P36NKMU4 Technical & Service Manual page 105

Check code
Connecting excessive number of units and branch boxes
7102
(EF)
Abnormal points and detection methods
When the connected indoor units exceed the limit, a check code <7102> is
displayed.
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Check whether the connecting unit
exceeds the limit or not.
Does it exceed the limit?
Check if at least 1 indoor unit is connected.
Is an indoor unit connected?
OCH811A
Diagnosis
No
Yes
Causes and checkpoints
Connecting more indoor units than the limit.
Abnormal if connecting status does not comply with the
following limit;
Maximum connectable indoor unit.
Connect at least 1 indoor unit (Abnormal if connected
none).
Connectable up to 2 branch boxes.
Connect less number of units than the
Yes
limit.
The model code of the connected indoor
unit can be displayed by an operation of
SW1 on the outdoor unit.
No
Check whether the M-NET line to the
indoor unit is connected or not.
105
Remedy
Connect indoor unit.