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4-6 Troubleshooting by symptoms
4-6-1 Communication error after finishing tracking (E202)
1. Check items
1) Is the communication cable short/open?
2) Is there a response from the Hydro unit PCB?
2. Check procedure
No
Yes
Is there a response from the
Hydro Unit
PCB?
(LED01(RED) in NOT 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
exchange the Hydro 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 unit
and restart the unit.
If the communication still doesn’t work,
replace the comm. kit PCB and
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.
outdoor unit PCB in order of mention.
cf.) If there is no oscillo scope, it can be replaced multimeter instead of osillo scope.
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