Communication Error Between Indoor And Outdoor Units During Tracking - Samsung AM072/096/120/144FXVAFH Service Manual

Troubleshooting

Communication Error between Indoor and Outdoor Units during Tracking

✳✳
AM038/048/055KXWD
Outdoor unit display
Operation Defrost
Indoorunit display
※ ● :
Judgment Method ∙ Communication error between indoor and outdoor units.
Cause of problem
∙ Refer to the how to check below..
1. How to check
Indoor unit installation quantity setup switch of
outdoor unit compare and check the set value and the
actual number of indoor units installed.
Are the number of actual installed indoor units
and the set value for the installation quantity setup
switch the same?
Press the reset key (K3) of the outdoor PCB, and check
the display module to check for the quantity of indoor
units that respond to the tracking..
Is there no sign of the indoor response on the display
during 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 the voltage between the 2 cables a square wave with
DC±0.7V or more?
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 change the indoor unit PCB.
4-28
Duct, Cassette (1/2 Way),Console, Celing
Timer Fan Filter/MPI Operation Defrost
× × ◑ ◑
×
◑ : × :
ON Flash OFF
Yes
Yes
Yes
Cassette (4/Mini4 Way)
Timer Filterr 18℃
× ◑ ◑ × ×
No
After set the installation quantity correctly using outdoor
unit KEY mode, reset the tracking by pressing outdoor
unit PCB reset KEY(K3).
No
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
No
Change the indoor unit PCB after checking the
communication cable when there is no peculiarity
with the address.
Check the communication cable and the connector of
the outdoor unit PCB, and change the PCB.
(cont.)
Wall-mounted (NeoForte)
21℃ Timer 24℃ 27℃
× ◑ ◑ ×
incorrectly set.
Samsung Electronics