Communication Error Between Indoor And Outdoor Units During Tracking - Samsung AM072FXVAFH series Service Manual

Troubleshooting

Communication Error between Indoor and Outdoor Units during Tracking

✳✳
AM038/048/055KXWD
Outdoor unit display
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
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
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
Check the communication cable which connects the outdoor unit to
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
Operation Defrost Timer Fan
× × ◑ ◑
※ ● : ◑ : ×:
ON Flash OFF
switch the same?
Yes
during tracking?
Yes
DC±0.7V or more?
Yes
the indoor unit.
Cassette (4/Mini4 Way)
Filter/MPI Operation Defrost Timer
× ◑ ◑
×
No
After set the installation quantity correctly using outdoor
unit KEY mode, reset the tracking by pressing outdoor
No
After 2 minutes, find the indoor unit which displays the
communication error for the indoor units, and check
(If the indoor unit addresses are overlapped, then a
- In this case, a communication error will occur in
every indoor unit (two or more units) with the address
No
communication cable when there is no peculiarity
Check the communication cable and the connector of
the outdoor unit PCB, and change the PCB.
(cont.)
Wall-mounted (NeoForte)
Filterr 18℃ 21℃ Timer
× × × ◑
unit PCB reset KEY(K3).
for overlaps in the PCB address setup.
communication error will occur).
incorrectly set.
Change the indoor unit PCB after checking the
with the address.
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