Troubleshooting
4-29
4-4-5. Communication error after finishing Tracking (E202)
No
Yes
No
Yes
Is there a response from the indoor 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
n
i
Check the communication cable and
replace the indoor unit PCB
Remove the communication cable
connecting the outdoor unit to indoor unit,
and measure the signal on LINE 2 of the
outdoor unit with a scope
Reconnect the cable connecting the outdoor unit
to the indoor unitand restart the unit.
If the communication still doesn’t work,
replace the indoor unit PCB.
Check the communication
cable in the outdoor unit PCB
and replace the PCB
Indoor unit display 360 Cassette
x(Ice blue) ◑(Yellow green) x(Blue) x(Red)
Judgment method Refer to checking method, as shown below
Symptom If the communication error between the indoor and outdoor unit for two minutes.
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