LG ARNU Series, Service Manual

Page: 169 / 226

Service Manual 169
Troubleshooting Guide
Excessive capaci-
ty
(Indoor capacity
is in excess )
Error
Code
Error Contents Meaning Main Causes
Error display
position
51
The combined spec of the
indoor units excess the
capacity of the outdoor unit
Concerned
Remote
Controller
Outdoor unit
1. Excess of indoor capacities more
than 130% of the outdoor unit
2. Auto-Addressing is not in operation
.
3. The communication cable connec-
tion error ie the indoor unit connect-
ed to some other outdoor unit has
the communication cable mixed up
or confused
■
Defect inspection method
1) Check the total capacity of the all indoor units and compare it with the 130% of the capacity of the outdoor unit .
2) Check whether the communication cable of some of the indoor unit is connected to some other outdoor unit
(Refer to CH05)
3) Please operate the Auto-Addressing.
4) In case the error code is still in display even when the above given contents are normal then please replace the
PCB .
5) In case the error code exists even after the outdoor PCB is replaced then please check the indoor PCBs one
by one
To carry out Auto-Addressing
function, press red button until
you see '88 'displayed on 88
segment as shown in left
side picture.
7 segment