Communication Tracking Error(E604) - Samsung AE090JXYDEH Service Manual

4-3-4 Communication tracking error(E604)

1. Check procedure
Is there a response from the CONTROL KIT PCB?
Remove the communication cable between
CONTROL KIT and the OUTDOOR UNIT, and
measure the LINE 2 (F3,F4) signal of the outdoor
voltage waveform between the lines square
wave with amplitude over ±0.7V as shown
in the following picture?
Reconnect the cable and reset the power.
If the problem is not solved, replace the
communication PBA and
the OUTDOOR UNIT PCB.
+0.7V
-0.7V
Samsung Electronics
(LED900 (red) is ON)
Yes
LED900
unit with a scope.
In this case, is the
Yes
Good
No
Check the communication cable and
replace the CONTROL KIT PCB.
No
Check the communication cable in the
OUTDOOR UNIT PCB and replace the PCB.
Bad
Troubleshooting
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