Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 259

[ IX Troubleshooting ]
Error
Error source
Code
7106
7107 BC controller
Error definition and error
detection method
Attribute setting error MA remote controller intended
for use with indoor units, such
as an MA remote controller, is
connected to the OA process-
ing unit whose attribute is FU.
Port setting error (1) Model total of indoor units
The port with wrong num-
ber is connected to the
indoor unit.The model to-
tal connected to the port
Total port number
is greater than the speci-
Single branching
fication.
2 branches merge
(2) 4 or more indoor units are
(3) When two ports are used,
(4) For the address of the BC
(5) In the system to which
(i) The indoor unit address
(ii) The indoor unit address
(iii) he indoor unit address
Address setting
Cause
per each port or per each
port merge is greater than
the specification.
Model total
54
96
connected to the same
port.
the port with the smaller
number is not connected
to the indoor unit.
controller (Sub 1 or 2), 50
is not added to the small-
est indoor unit address,
which is connected to the
BC controller (Sub1 or 2).
multiple BC controllers are
connected, the indoor unit
address connected to the
BC controller is not set as
shown below.
which is connected to the
BC controller (main)
which is connected to the
BC controller (Sub1)
which is connected to the
BC controller (Sub2)
(i)<(ii)<(iii)
*(ii) and (iii) can be re-
versed.
- 250 -
Check method and remedy
To operate the OA processing unit
using remote controllers for indoor
units, such as MA remote controller,
set the DipSW3-1 on the OA pro-
cessing unit to ON.
Operation method SW 3-1
Interlock with
OFF
the indoor unit
Direct operation with
ON
the MA remote controller
Before resetting the port number
using the port number setting
switch or the model using the
model (capacity code) setting
switch, turn off the power of the
heat source unit, the BC control-
ler and the indoor unit.