Samsung AVXC1H022 series Service Manual page 300

I
: Communication Error between Indoor Unit and Outdoor Unit after Completion of Tracking
Outdoor unit display
Indoor unit display
Judgment method
Causes
Check the display part with pressing the reset
key (K3) of the outdoor unit PCB.
indoor unit at the display during tracking?
Remove the communication wire connected
from the outdoor unit to the indoor unit and then
measure 2 wires of the outdoor unit with scope.
between both wires square wave
Check the communication wire connected from the
outdoor unit to the indoor unit. If there is no defect,
search the indoor unit that interrupts the communication by
connecting the indoor unit one by one. After pre-checking
the wire, replace the indoor unit PCB.
0.7V
0.7V
Samsung Electronics
(Operation)
In case there is no communication between indoor unit and outdoor unit for 2 minutes during
the operation (When not being received in every room)
Communication error between the indoor unit and outdoor unit.
Is there any response of the
Yes
Yes
Is the voltage
over DC ±0.7V?
Yes
(Timer) (Fan) (Filter)
No
Search for the indoor unit displayed the
communication error after 2 minutes and check the
duplication of PCB address setup.
(The communication error is occurred due to address
duplication.)
- In this case, the communication error is occurred at
every indoor unit (over 2 units) set wrong address.
If there is no defect in address, replace the indoor unit
PCB after checking the communication wire.
No
After checking the communication wire
and connector of the outdoor unit PCB,
Good
Troubleshooting
(Defrost)
replace the PCB.
Bad
9-56