Communication Error Between Indoor & Outdoor Units After Completing Tracking - Samsung AVXCSH023/032/040CE Service Manual

Troubleshooting
4-3-19 Communication error between Indoor & Outdoor units after Completing Tracking
Outdoor unit display
Indoor unit display
• When the communication between indoor/outdoor units cut-off for 2 minutes (all chambers fail to receive)
Criteria
• Communication error between indoor/outdoor units and/or the erroneous setup switch setting for the
Cause of problem
number of indoor units installed.
1. How to check
Press the reset key (K3) of the outdoor unit
PCB then check the display part.
Is there any response from
indoor units on the display part
Remove a communication line from the
outdoor unit to indoor units then measure
2 lines on the outdoor unit with SCOPE.
At that time, is the power
between the 2 lines a square wave?
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.
0.7V
0.7V
4-58
(Operation) (Timer) (Fan)
during tracking?
Yes
Yes
Yes
(Filter) (Defrost)
No
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.
If there is any problem with the address, check the
communication line then replace indoor unit PCB.
No
Check the outdoor unit PCB
communication line and connector
then replace the PCB
* If communication error occurs, please refer to
pages 4-50 see essential pre-checkup details.
Good
Defective
Samsung Electronics