Samsung AM080xXV Series - Communication Error between Main and Sub Unit of Outdoor Unit or between Outdoor Units

Troubleshooting
Samsung Electronics 4-25
4-3-5 Communication error between main and sub Unit of outdoor unit or between outdoor units
1.
Cause of problem
Essential Requirements before Changing PCB in Case of Communication Error: Refer to p.59
Check the outdoor unit with error.
(U200, U201, U202, U203)
Check operation of LED and
7-SEG each SUB UNIT normally.
Change wiring or connect
No
Re-address Outdoor unit
No
Yes
Yes
Check connection of communication
wire between Indoor unit and
Outdoor unit.
Check address of Outdoor unit.
Replace MAIN PCB
Yes
Reset error (Key 3)
Yes
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
× × ◑ ◑ × × ◑ ◑ × × ◑ ◑
※ ●: ON ◑: Flash ×: OFF
Judgment
Method
∙ Refer to the judgment method below.
Cause of
problem
∙ Communication error between outdoor units.