Connecting Excessive Number Of Units And Branch Boxes - Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual

Check code
7102
(EF)
Abnormal points and detection methods
When the connected indoor unit exceeds 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
exceeds the limit or not.
Does it exceed the limit?
Check if at least 1 indoor unit is connected.
Is an indoor unit connected?
OCH632A
Connecting excessive number of units
and branch boxes
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;
1 Connectable up to 12 indoor units
2 Connect at least 1 indoor unit (Abnormal if
connected none).
3 Connectable up to 2 branch boxes
4 Connectable up to 1 Air to Water unit (PWFY unit,
Cylinder unit, or Hydrobox)
5 When connecting PWFY unit, Cylinder unit, or
Hydrobox, connect at least 1 indoor unit (other than
Air to Water unit).
6 Connectable up to 1 PEFY-P·VMH-E-F
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.
100
Remedy
Connect indoor unit.