Samsung AM007FN1DCH/AA - Communication Error between Main and Sub Unit of Outdoor Unit or between Outdoor Units

Troubleshooting
4-58 Samsung Electronics
4-4-24 Communication error between main and sub Unit of outdoor unit or between outdoor units
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 Communication error between outdoor units.

Refer to the judgment method below.
Indoorunit display
Judgment Method
Cause of problem
Outdoor unit display
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.
Replace PCB.
Check the power
Change wiring or connect
Change settings
Ye s
Ye s
Ye s
No
No
No
1.
Cause of problem
Essential Requirements before Changing PCB in Case of Communication Error: Refer to p.59