Troubleshooting
Samsung Electronics
33
3-2 Communication error between indoor and outdoor units after completing tracking
(Error Code : E202)
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
0.7V
0.7V
Good
Defective
If there is any problem with the address, check the
communication line then replace indoor unit PCB.
Yes
No
No
Yes
