Communication Error After Finishing Tracking (E202) - Samsung AC036JB1DEC Service Manual

4-4-4 Communication error after finishing Tracking (E202)

Indoor unit display
Symptom
Failure
Is there a response from the indoor PCB?
(LED01 (RED) is not ON)
Yes
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
In this case, is the
voltage waveform between the lines square
wave with amplitude over ±0.7V as shown
in the following picture?
Yes
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.
+0.7V
-0.7V
4-30
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4way
X (Operation)
1way X (Operation)
Communication error between the indoor and outdoor unit for two minutes
Communication error between the indoor unit and outdoor unit
LED01
Good
(Defrost) (Timer) X (Filter)
X (Defrost) (Reservation) (Fan) X (Filter)
No
Check the communication cable and
replace the indoor unit PCB
No
Check the communication
cable in the outdoor unit PCB
and replace the PCB
Bad
Samsung Electronics