Samsung AVXCSH022EE Service Manual page 173

4-5-23 Communication error between main and sub Micom of outdoor unit or between outdoor units
Outdoor Unit Display
Indoor Unit Display
Judgment Method
Special Cause
1. Faulty communication between outdoor units
Reset error (Key 3)
Check the outdoor unit with error
(U200, U201, U202, U203).
Is the power supply normal?
15V, 5V
Check wiring of outdoor unit
communication cable.
Check K13 and K14 setup
options for outdoor unit.
Change PCB.
❈ Essential Requirements before Changing PCB in Case of Communication Error: Refer to p.4-80
Samsung Electronics
x x x ( x x x : Address of the indoor unit with error)
No
Yes
No
Yes
No
Yes
Check power.
Change wiring or connect.
Change settings.
Troubleshooting
4-82