Troubleshooting
Samsung Electronics
59
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
No
Yes
Is there a response from
the CONTROL KIT PCB.
(LED901(ORN) is blinking)
No
Yes
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 CONTROL KTI PCB.
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.
Reconnect the cable and reset the power.
If the problem is not solved, replace
the communication PBA and the OUTDOOR
UNIT PCB.
Check the communication
cable in each PCB
and replace the PCB
Yes
Is the power/communication
cable connected correctly?
No
Connect the power/communication
cable correctly.
cf.) If there is no oscillo scope, it can be replaced multimeter instead of osillo scope.
