Communication Error After Finishing Tracking(Hydro Unit) - Samsung AE044MXTPEH Service Manual

Troubleshooting

4-4-6 Communication error after finishing Tracking(Hydro unit)

Error Mode
Symptom
Failure
Is there a response from the Hydro unit PCB?
(LED01 (RED) is not ON)
Remove the communication cable connecting
the outdoor unit to Hydro unit unit, and
measure the signal on LINE 2 of the outdoor
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 Hydro unit unit
If the communication still doesn't work,
replace the Hydro unit unit PCB.
+0.7V
-0.7V
74
E201, E202
Communication error between the Hydro unit and outdoor unit for two minutes
Communication error between the Hydro unit unit and outdoor unit
Yes
LED01
unit with a scope
In this case, is the
Yes
and restart the unit.
Good
No
Check the communication cable and
replace the Hydro unit unit PCB
F1, F2
No
Check the communication
cable in the outdoor unit PCB
and replace the PCB
Bad
Samsung Electronics