Samsung AM072FXVAFH series Service Manual page 129

Communication error between main and sub Unit of outdoor unit or between outdoor units
✳✳
AM038/048/055KXWD
Outdoor unit display
Indoorunit display
Judgment Method ∙ Refer to the how to check below.
Cause of problem ∙ Communication error between outdoor units.
1. How to check
Check the outdoor unit that is failure occurs.
Is the power supply normal?
Check the wiring of outdoor unit
Confirmation of outdoor unit setup options
Samsung Electronics
Duct, Cassette (1/2 Way),Console, Celing
Operation Defrost Timer Fan
× × ◑ ◑
※ ● : ON ◑ : Flash × : OFF
Reset error (Key 3)
(U200, U201, U202, U203)
Yes
15V, 5V
Yes
communication wire.
Yes
K13, K14
Yes
Replace PCB
Essential Requirements before Changing PCB in Case of Communication Error : Refer to 63 page.
Cassette (4/Mini4 Way)
Filter/MPI Operation Defrost Timer
× ◑ ◑
×
No
No
No
Wall-mounted (NeoForte)
Filter 18℃ 21℃ Timer
× × × ◑
Check the power
Change wiring or connect
Change settings
Troubleshooting
(cont.)
24℃ 27℃
◑ ×
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