Troubleshooting
24
Samsung Electronics
4-
3
-2
Comm
uni
cat
i
o
n
error
b
et
w
ee
n ind
oor
a
nd
o
u
t
d
oor
uni
ts
a
f
ter
com
p
let
ing
trac
king
(E
rror
Co
d
e
: E2
0
2)
1. How to check
Press the reset key (K3) of the outdoor unit PCB
then check the display part.
At that time, is the power
between the 2 lines a square wave?
Is there any response from
indoor units on the
display part during tracking?
Remove a communication line
from the outdoor unit to indoor units then
measure 2 lines on the
outdoor unit with SCOPE.
Reconnect the communication line from the
outdoor unit to indoor units then remove all communication
connectors on the indoor unit PCB then find an indoor unit
that hampers communication by making a connection to
each unit and replace indoor unit PCB after checking out lines.
After 2 minutes, find an indoor unit than shows a
communication error then check if PCB address setup
has overlapped. (If an indoor unit's address is overlapped,
communication error occurs)
- In that case, all indoor units with wrong address
setup for more than 2 will have communication error.
Check the outdoor unit PCB communication
line and connector then replace the PCB
If there is any problem with the address, check the
communication line then replace indoor unit PCB.
Yes
No
No
Yes
0.7V
0.7V
Good
Defective
