Connecting Excessive Number Of Units And Branch Boxes - Mitsubishi Electric MXZ-4C36NAHZ Service Manual

Check code

Connecting excessive number of units and branch boxes

7102
Abnormal points and detection methods
When the connected indoor units or branch boxes exceed the limit, a
check code <7102> is displayed.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Check whether the connecting unit and
branch box exceeds the limit or not.
Does it exceed the limit?
Check if at least 1 indoor unit is connected.
Is an indoor unit connected?
OCH573
Diagnosis
No
Yes
Causes and check points
Connecting more indoor units and branch boxes than
the limit.
Abnormal if connecting status does not comply with the
following limit;
Connectable up to 4 (4C36), 5 (5C42), 8 (8C48) units
Connect at least 1 indoor unit (Abnormal if connected
none)
Connectable up to 2 branch boxes
Connect less number of units and branch
Yes
boxes than the 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.
97
Remedy
Connect indoor unit.