Communication Error Between Main And Sub Unit Of Outdoor Unit Or Between Outdoor Units - Samsung AM072BXV Series Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)
4-3-5 Communication error between main and sub Unit of outdoor unit or between outdoor
units
Outdoor unit
display
Duct, Cassette (1/2 Way),Console, Celing
Operation
Indoorunit
display
×
※ ● : ON ◑ : Flash ×: OFF
Judgment
• Refer to the judgment method below.
Method
Cause of
• Communication error between outdoor units.
problem
1. Cause of problem
Check the outdoor unit with error.
Check connection of communication
wire between Indoor unit and
Check address of Outdoor unit.
Check operation of LED and
7-SEG each SUB UNIT normally.
Samsung Electronics
Defrost Timer Fan Filter/MPI Operation
×
◑ ◑
Reset error (Key 3)
(U200, U201, U202, U203)
Yes
Outdoor unit.
Yes
Yes
Yes
Replace MAIN PBA
Essential Requirements before Changing PBA in Case of Communication Error: Refer to p.59
Cassette (4/Mini4 Way)
Defrost Timer Filter Operation
× ×
◑
No
No
Wall-mounted (NeoForte)
Timer
× ×
◑
Change wiring or connect
Re-address Outdoor unit
Turbo
◑ ◑
85