Samsung AVMKH020EA4 Service Manual page 198

11-2-8 Communication error between the indoor unit and outdoor unit on tracking
Outdoor unit display
Indoor unit display
Judgment method
Causes
Compare and check the setting switch
setup value for indoor unit installation number
of outdoor unit PCB with the actual
indoor unit installation number.
indoor unit installation number and the
setting switch setup value for indoor
unit installation number?
Press the reset key(K3) of the outdoor unit PCB
and check the number of indoor unit
responding to the tracking at display part.
Is there any response
of indoor unit at display part
Remove the communication wire connecting
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 connecting
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. And after check a wire,
displace the indoor unit PCB.
Samsung Electronics
(Operation) (Timer)
- When the number of indoor unit of installation switch mismatch with communicated
indoor unit on tracking the outdoor unit
- Communication error between the indoor unit and outdoor unit, and the setting switch
setup error for the installation number of indoor unit
Is same the actual
Yes
on tracking?
Yes
Is the voltage
over DC0.7V?
Yes
(Fan) (Filter) (Removing frost)
No
After right setting the setting switch setup
value for indoor unit installation number of
outdoor unit, perform the tracking again by
pressing the reset key(K3) of PCB.
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 the every indoor unit
(over 2ea) set wrong address.
No
If there is no defect in address,
replace the indoor unit PCB after check the
After check the communication wire
and connecter of the outdoor unit PCB,
replace the PCB.
Troubleshooting
communication wire.
11-12