Samsung AM072/096/120/144FXVAFH, Service Manual

Page: 129 / 295

Troubleshooting
4-32 Samsung Electronics
4-4-5 Communication error between main and sub Unit of outdoor unit or between outdoor units
1. How to check
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.