Control Kit/Outdoor Unit Communication Error (E202) - Samsung AE090JXYDEH Service Manual

4-3-2 CONTROL KIT/OUTDOOR UNIT communication error (E202)

1. Check items
1) Is the communication cable SHORT or OPEN?
2) Is there a response from the CONTROL KIT PCB?
2. Check procedure
Is there a response from
the CONTROL KIT PCB.
(LED901(ORN) is blinking)
Is the power/communication
cable connected correctly?
Remove the communication cable between CONTROL KIT
and the OUTDOOR UNIT, and measure the LINE 2 (F3,F4)
signal 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 and reset the power.
If the problem is not solved, replace
the communication PBA and the OUTDOOR
+0.7V
-0.7V
cf.) If there is no oscillo scope, it can be replaced multimeter instead of osillo scope.
Samsung Electronics
Yes
Yes
In this case, is the
Yes
UNIT PCB.
Good
No
Check the communication cable
and replace the CONTROL KTI PCB.
No
Connect the power/communication
cable correctly.
No
Check the communication
cable in each PCB
and replace the PCB
Bad
Troubleshooting
59