Connecting Unit Number Error; 7102 - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

Check code

7102

(EF)
Abnormal points and detection methods
When the connected indoor unit exceeds the limit, 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?
OCH760

Connecting unit number error

Diagnosis
No
Yes
Causes and checkpoints
Connecting more indoor units and branch boxes than
the limit.
If connecting status does not comply with the following
limit;
Connectable up to 30 indoor units
Connect at least 1 indoor unit (If connected none).
Connectable up to 3 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.
89
Remedy
Connect indoor unit.