Samsung NS140HHXEA Service Manual page 57

4-6-12 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
Restart after power off.
Is the communication error
occurred again?
Isn't the power cable and
communication cable wiring error?
Is the connection of
communication cable normal?
Exchange the outdoor unit PCB.
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No
Yes
No
Yes
No
Yes
Terminate the service.
Correct the wrong wiring.
Correct the connection of
communication cable.
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