Samsung Electronics
84
Troubleshooting
1. Cause of problem
0.7V
0.7V
Good
Defective
Press the reset key (K3) of the outdoor unit PBA
and check the display module.
Is the voltage between
the 2 cables a square wave with DC±0.7V or more
as shown in the image below?
Is there no indoor unit
response at all from the display module during
the tracking?
Remove the communication cable that connects
the outdoor unit to the indoor nit, and measure
the 2 outdoor unit cables with a scope.
Connect the communication cable again to
connect the outdoor unit to the indoor unit.
Remove all the communication connectors on the PBA of
the indoor unit, and connect them one by one to find
the indoor unit which interferes with the communication
to check and change the indoor unit PBA.
After two minutes, find the indoor unit which displays the
communication error and check if the PBA address settings are
overlapped. (Communication error occurs if the indoor unit
addresses are overlapped.)- In this case, the communication
error will occur in every indoor unit (2 or more units) with the
address incorrectly set.
Check the communication cable and the
connector for the outdoor unit PBA,
and change the PBA.
If there is no peculiarity in the address, check
the communication cable and change the indoor unit PBA.
Yes
No
No
Yes
* Essential Requirements before Changing PBA in
Case of Communication Error: Refer to p.50
Outdoor unit
display
Indoorunit
display
Duct, Cassette (1/2 Way),Console, Celing
Cassette (4/Mini4 Way)
Wall-mounted (NeoForte)
Operation Defrost Timer Fan Filter/
MPI Operation Defrost Timer Filter Operation Timer Turbo 24
℃
27
℃
×
×
◑
◑
×
×
◑
◑
×
×
×
◑
◑
×
※ ●
: ON
◑
: Flash ×: OFF
Judgment
Method
• Outdoor unit is unable to communicate for two minutes during operation. (no reception of relocation)
Cause of
problem
• Communication error between indoor and outdoor units and setup error of indoor unit installation quantity setup switch.
4-3 Appropriate Measures for Different Symptom (cont.)
4-3-4
Communication Error between Indoor and Outdoor Units after Tracking
