Mitsubishi Electric PURY-P72 Service Handbook page 261

[ IX Troubleshooting ]
1. Error Code
7107
Port setting error
2. Error definition and error detection method
The port with wrong number is connected to the indoor unit.The model total connected to the port is greater than the specifi-
cation.
3. Cause, check method and remedy
Error source
BC controller (1) Model total of indoor units per each port or per
each port merge is greater than the specification.
(2) 4 or more indoor units are connected to the same
port.
(3) When two ports are used, the port with the smaller
number is not connected to the indoor unit.
(4) For the address of the BC controller (Sub 1 or 2),
50 is not added to the smallest indoor unit address,
which is connected to the BC controller (Sub1 or
2).
(5) In the system to which multiple BC controllers are
connected, the indoor unit address connected to
the BC controller is not set as shown below.
(i) The indoor unit address which is connected to
(ii) The indoor unit address which is connected to
(iii) he indoor unit address which is connected to
Address setting
HWE0803A
Cause
Total port number Model total
Single branching
2 branches merge
the BC controller (main)
the BC controller (Sub1)
the BC controller (Sub2)
(i)<(ii)<(iii)
*(ii) and (iii) can be reversed.
YES
Is there a BC
controller (Sub)?
NO
YES
Are 4 or more indoor units
Port No. setting error?
connected to the same port?
NO NO
Adjust the piping
Is the model total of indoor
YES
connection to the port.
units connected to the same port
greater than the item (1)?
NO
When two ports are used,
is the port with the smallest number
Port No. setting error?
connected to the indoor unit?
NO
NO
The wrong model
(capacity code) is set.
NO
Adjust the piping
Change the port No.
connection to the port.
Check method and remedy
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
outdoor unit, the BC controller and the
indoor unit.
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69
For the address of the BC
controller (Sub), is 50 added to
the smallest indoor unit address,
which is connected to the
BC controller (Sub)?
YES
Change the port No.
Is the address of the indoor
unit, which is connected to the the
BC controller (Main) ,smaller than
that of the indoor, which is
connected to the BC controller
YES
Change the port No.
Is the address of the indoor
unit, which is connected to the the
Change the set
YES
BC controller (Main), smaller than
indoor unit model
that of the indoor, which is
(capacity code).
connected to the BC controller
- 252 -
Change the BC
NO
controller
(Sub) address.
YES
Change the indoor
NO
unit address or
change the BC
controller address
(Sub 1 or 2)?
YES
NO
(Sub 1 or 2)?
YES
GB