Communication Error Between Main And Sub Unit Of Outdoor Unit Or Between Outdoor Units - Samsung AM072/096/120/144FXVAFH Service Manual

Communication error between main and sub Unit of outdoor unit or between outdoor units

✳✳
AM038/048/055KXWD
Outdoor unit display
Operation Defrost
Indoorunit display
※ ● : ON ◑ : Flash × : OFF
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.
(U200, U201, U202, U203)
Is the power supply normal?
Check the wiring of outdoor unit
communication wire.
Confirmation of outdoor unit setup options
Samsung Electronics
Duct, Cassette (1/2 Way),Console, Celing
Timer Fan Filter/MPI Operation Defrost
× × ◑ ◑
×
Reset error (Key 3)
Yes
15V, 5V
Yes
Yes
K13, K14
Yes
Replace PCB
Essential Requirements before Changing PCB in Case of Communication Error : Refer to 63 page.
Cassette (4/Mini4 Way)
Timer Filter 18℃
× ◑ ◑ × ×
No
Check the power
No
Change wiring or connect
No
Change settings
Troubleshooting
(cont.)
Wall-mounted (NeoForte)
21℃ Timer 24℃ 27℃
× ◑ ◑ ×
4-33