Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 308

Error
Error definition and error
Error source
Code
7102 Outdoor unit Error in the number of
connected units
The number of connect-
ed indoor units is "0" or
exceeds the allowable
value.
7105 Outdoor unit Address setting error
BC controller
Erroneous setting of OC
unit address
Erroneous setting of BC
controller address
detection method
(1) Number of indoor units
connected to the outdoor
terminal block (TB3) for in-
door/outdoor transmission
lines exceeds limitations
described below.
Number of units
(2) The outdoor unit address
is set to 51-100 although
the address is automatical-
ly set up (MA remote con-
troller). ("HO" appears on
the display on MA remote
controller.)
(3) Disconnected transmis-
sion line of the outdoor unit
(4) Short-circuited transmis-
sion line
When (3) and (4) apply,
the following display will
appear.
In case of M-NET remote
controller
-> Nothing appears on the
display as no power is
supplied to the remote
controller.
In the case of MA remote
controller
-> "HO" will blink
(5) Disconnected transmis-
sion line on BC controller
Erroneous setting of OC unit
address
The address of outdoor unit is
not set to 00 or to 51 - 100.The
address of BC controller is not
set to 51 - 100.
- 299 -
Cause Check method and remedy
1) Check whether the number of
units connected to the outdoor
terminal block (TB3) for indoor/
outdoor transmission lines does
not exceed the limitation. (See
(1) to (4) on the left.)
2) Check (2) - (5) on the left.
Restriction on the
3) Check whether the transmission
number of units
1-15 : P72 model
line for the terminal block for
centralized control (TB7) is not
1-19 : P96 model
connected to the terminal block
1-20 : P108 P126 models
for the indoor/outdoor transmis-
1-24 : P144 - P204 models
sion line (TB3).
1-32 : P216 P234 models
1
(P72 - P126
models only)
0 or 1
0,1 or 2
0 or 1
Check that the address of the OC unit
and the BC controller is set to 51 - 100.
If the outdoor unit address is out of the
allowable range, turn off the power of
the outdoor unit, and set the address
again.
If the BC controller address is out of
the allowable range, turn off the power
of both the outdoor unit and the BC
controller, and set the address again.
[ IX Troubleshooting ]