Mitsubishi Electric PUHY-P168, Service Handbook, Page: 308 / 404

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[
IX
Troubleshooting ]
7102 Outdoor unit Error in the number of
connected units
The number of connect-
ed indoor units is "0" or
exceeds the allowable
value.
(1) Number of indoor units
connected to the outdoor
terminal block (TB3) for in-
door/outdoor transmission
lines exceeds limitations
described below.
(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.
Œ
In case of M-NET remote
controller
-> Nothing appears on the
display as no power is
supplied to the remote
controller.
Œ
In the case of MA remote
controller
-> "HO" will blink
(5) Disconnected transmis-
sion line on BC controller
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.
3) Check whether the transmission
line for the terminal block for
centralized control (TB7) is not
connected to the terminal block
for the indoor/outdoor transmis-
sion line (TB3).
7105 Outdoor unit
BC controller Address setting error
Erroneous setting of OC
unit address
Erroneous setting of BC
controller address
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.
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.
Error
Code
Error source
Error definition and error
detection method
Cause Check method and remedy
1-15 : P72 model
1-19 : P96 model
1-20 : P108 P126 models
1-24 : P144 - P204 models
1-32 : P216 P234 models
1
0 or 1
0,1 or 2
0 or 1
(P72 - P126
models only)
Restriction on the
number of units
Number of units
2) Number of BC
controllers
3) Number of Main
BC controllers
4) Number of Sub
BC controllers
5) Total number of
LOSSNAY units
(During auto
address
start-up only)
1) Total number of
indoor units