Samsung AE044MXTPEH - Communication Error after Finishing Tracking(Hydro Unit)

Troubleshooting
74
Samsung Electronics
Error Mode
E201, E202
Symptom
Communication error between the Hydro unit and outdoor unit for two minutes
Failure
Communication error between the Hydro unit unit and outdoor unit
4-4-6 Communication error after finishing Tracking(Hydro unit)
No
Yes
No
Yes
Is there a response from the Hydro unit PCB?
(LED01 (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 Hydro unit unit PCB
Remove the communication cable connecting
the outdoor unit to Hydro unit unit, and
measure the signal on LINE 2 of the outdoor
unit with a scope
Reconnect the cable connecting
the outdoor unit to the Hydro unit unit
and restart the unit.
If the communication still doesn’t work,
replace the Hydro unit unit PCB.
Check the communication
cable in the outdoor unit PCB
and replace the PCB
LED01
F1, F2