Communication Error Between Indoor And Outdoor Units During Tracking - Samsung AVXCSH023/032/040CE Service Manual

Troubleshooting

4-3-18 Communication error between Indoor and Outdoor units during Tracking

Outdoor unit display
Indoor unit display
• Communication error between indoor and outdoor units
Criteria
• Refer the below
Cause of problem
1. How to check
Compare the number of setting values of
setup switch for the number of indoor unit
installed for the outdoor unit PCB and the
number of actual indoor units installed.
Is the number of actual
indoor units installed and the number of
setting values of setup switch for the number of
indoor unit installed identical?
Press the reset key (K3) of the outdoor unit PCB
then check the display part to see the number
of indoor units responding to the tracking.
Is there any response from indoor units
on the display part during tracking?
Remove 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 with DC±0.7?
Check the communication line from the outdoor unit
to indoor units and if there is no problem, find an
indoor unit that hampers communication by making a
connection to each unit and replace the indoor unit PCB
after checking out lines.
4-56
(Operation) (Timer) (Fan)
Yes
Yes
Yes
(Filter) (Defrost)
No
Set the correct number of indoor units on the
outdoor unit switch and press the reset key (K3)
on the outdoor unit PCB to execute tracking.
No
After 2 minutes, find an indoor unit that 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.
No
If there is any problem with the address,
check the communication line then replace
indoor unit PCB
Check the outdoor unit PCB communication line
and connector then replace the PCB
Samsung Electronics