Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 80

7102 (EF): Connecting excessive number of units and branch box-
Abnormal points and detection methods
The number of the connected indoor units exceeds the
limit, error code 7102 is displayed.
Diagnosis of failure
Check whether the number of the connected
indoor units exceeds the limit or not.
Does it exceed the limit?
Check if at least 1 indoor unit is connected.
Is an indoor unit connected?
OCH790 _80
es
Yes
No
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 12 indoor units
• Connect at least 1 indoor unit (Abnormal if connected
none).
• Connectable up to 2 branch boxes
• Connectable up to 1 Air to Water unit (PWFY unit, Cylin-
der Unit, or Hydrobox)
• When connecting PWFY unit, Cylinder Unit, or Hyd-
robox, connect at least 1 indoor unit (other than Air to
Water unit).
• Connectable up to 1 PEFY-P·VMH-E-F
Reduce the number of the connected units to fall
within the limit.
The capacity code of the connected indoor unit
can be displayed by an operation of SW1 on the
outdoor unit.
Connect an indoor unit.
Check whether the M-NET line to the indoor unit
is connected or not.