Sunlight Supply Samsung Programmable Thermostat for Split Systems - Manual (Page 108)

12-45 Samsung Electronics
12-2-12 Communication error
1. Checklist :
1) Is the communication cable between the indoor unit and outdoor unit connected correctly?
2) Isn’t the power cable and communication cable wiring error?
2. Troubleshooting procedure
Yes
Restart after power off.
Is the communication error
occurred again?
Isn't the power cable and
communication cable wiring error?
Exchange the outdoor unit PCB.
Terminate the service.
Correct the wrong wiring.
Is the connection of
communication cable normal?
Correct the connection of
communication cable.
Yes
Yes
No
No
No