Communication Error Between Indoor And Outdoor Units During Tracking - Samsung AM080FX A Series Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)

4-3-3 Communication Error between Indoor and Outdoor Units during Tracking

Outdoor unit
display
Duct, Cassette (1/2 Way),Console, Celing
Operation Defrost Timer Fan
Indoorunit
display
×
※ ● : ON ◑ : Flash ×: OFF
Judgment
∙ Communication error between indoor and outdoor units.
Method
Cause of
∙ Refer to the judgment method below.
problem
1. Cause of problem
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 PBA, 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
as shown in the image below?
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 PBA.
0.7V
0.7V
Samsung Electronics
Filter/
MPI
× ◑ ◑ ×
switch the same?
Yes
Yes
Yes
Good
Defective
Cassette (4/Mini4 Way)
Operation Defrost Timer Filter Operation Timer Turbo 24℃
× ◑ ◑
displays the communication error for the indoor units, and
check for overlaps in the PBA address setup.(If the indoor
No
the connector of the outdoor unit PBA,
* Essential Requirements before Changing PBA in Case of
Communication Error: Refer to p.50
Wall-mounted (NeoForte)
× × × ◑
No
Correctly set the indoor unit installation quantity setup
switch of the outdoor unit, and press the reset key (K3) of
the outdoor PBA to re-execute tracking.
No
After 2 minutes, find the indoor unit which
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 PBA after checking
the communication cable when there is
no peculiarity with the address.
Check the communication cable and
and change the PBA.
27℃
◑ ×
156