Samsung AVXC1H022 series Service Manual page 279

Troubleshooting
I Communication Error between Indoor Unit and Outdoor Unit during Tracking
Outdoor unit display
Indoor unit display
Judgment method
Causes
Compare and check the setting switch's
setup value for the indoor unit installation
number of the outdoor unit PCB with the actual
indoor unit installation number.
indoor unit installation number and the setting
switch's setup value for the indoor unit
Press the reset key (K3) of the outdoor unit
PCB and check the number of the indoor unit
responding the tracking at display part.
Is there any response of indoor unit at
display part 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.
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.
9-35
(Operation)
Communication error between the indoor unit and outdoor unit
Setup error of the setting switch for setting the number of indoor unit's to be installed.
Is same the actual
installation number?
Yes
Yes
Is the voltage
between both wires
square wave over
DC ±0.7V?
Yes
(Timer) (Fan) (Filter)
No
setup value for the indoor unit installation number
of the outdoor unit, perform the tracking again by
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.
No
replace the indoor unit PCB after checking the
After checking the communication wire and
connector of the outdoor unit PCB, replace the
(Defrost)
After right setting the setting switch's
pressing the reset key (K3) of PCB.
If there is no defect in address,
communication wire.
PCB.
Samsung Electronics