Product specifications

40 Samsung Electronics

4-2 Troubleshooting by symptoms

Indoor unit display

Symptom

Communication error between the indoor and outdoor unit for two minutes

Failure

Communication error between the indoor unit and outdoor unit

4-2-1 Communication error after finishing Tracking

Yes

Is there a response from the indoor PCB?

(LED900 (RED) is not ON)

In this case, is the

voltage waveform between the lines square

wave with amplitude over ±0.7V as shown

in the following picture?

+0.7V

-0.7V

Good

Bad

Check the communication cable and

replace the indoor unit PCB

Remove the communication cable

connecting the outdoor unit to indoor unit,

and measure the signal on LINE 2 of the

outdoor unit with a scope

Reconnect the cable connecting

the outdoor unit to the indoor unit

and restart the unit.

If the communication still doesn’t work,

replace the indoor unit PCB.

Check the communication

cable in the outdoor unit PCB

and replace the PCB

LED01

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