Communication Error After Finishing Tracking (E202) - Samsung AC018KN4DCH Service Manual

4-4-5. Communication error after finishing Tracking
Indoor unit display
Judgment method
Symptom
Is there a response from the indoor PCB?
(LED01 (RED) is not ON)
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
voltage waveform between the lines square
wave with amplitude over ±0.7V as shown in
the following picture?
Reconnect the cable connecting
the outdoor unit to the indoor unit
If the communication still doesn't work,
replace the indoor unit PCB.
+0.7V
-0.7V
360 Cassette
Refer to checking method, as shown below
If the communication error between the indoor and outdoor unit for two minutes.
Yes
In this case, is the
Yes
and restart the unit.
(E202)
x(Ice blue) ◑(Yellow green) x(Blue) x(Red)
No
Check the communication cable and
No
4-31
replace the indoor unit PCB
Check the communication
cable in the outdoor unit PCB
and replace the PCB
Troubleshooting