Samsung AM072FXVAFH series - Communication Error between Indoor and Outdoor Units During Tracking

Troubleshooting
4-28 Samsung Electronics
غ AM038/048/055KXWD ✳✳
1. How to check
Yes
Yes
Indoor unit installation quantity setup switch of
outdoor unit compare and check the set value and the
actual number of indoor units installed.
Press the reset key (K3) of the outdoor PCB, and check
the display module to chec
k for the quantity of indoor
units that respond to the tracking..
Remove the communication cable which connects
the outdoor unit to the indoor unit, and measure the 2
cables of the outdoor unit with a scope.
Is there no sign of the indoor response on the
display
during tracking?
Check the communication cable which connects the outdoor unit to
the indoor unit.
If there is no peculiarity, then connect the indoor units one by one
to find the indoor unit that is interfering with the communication for
inspection and ch
ange the indoor unit PCB.
Is the voltage between the 2 cables a square wave with
DC±0.7V or more?
Are the number of actual installed indoor units
and the set value for the installation quantity setup
switch the same?
After set the install
ation quantity correctly using outdoor
unit KEY mode, reset the tracking by pressing outdoor
unit PCB reset KEY(K3).
After 2 minutes, find the indoor unit which displays the
communication error for the indoor units, and check
for overlaps in the PCB address setup.
(If
the indoor unit addresses are overlapped, then a
communication error will occur).
- In this case, a communication error will occur in
every indoor unit (two or more units) with the address
incorrectly set.
Change the indoor unit PCB after checking the
communication cable when the
re is no peculiarity
with the address.
Check the communication cable and the connector of
the outdoor unit PCB, and change the PCB.
Yes
No
No
No
Communication Error between Indoor and Outdoor Units during Tracking (cont.)
Outdoor unit display
Indoorunit display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation
Defrost TimerFan Filter/MPI
Operation
Defrost Timer Filterr
18℃ 21℃
Timer
24℃ 27℃
××◑◑
×
×◑◑×××◑◑×
※ ● : ON ◑ : Flash ×: OFF
Judgment Method
 Communication error between indoor and outdoor units.
Cause of problem
 Refer to the how to check below..