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Troubleshooting
4-4-10. Communication error between outdoor unit INV
1. Test items
1) Is power supplied to outdoor unit Inverter PCB?
2) Check the power wire connection and fuse.
3) Is there a problem in the communication wire connections between the outdoor unit Inverter (CN31)
4) Check the communication wire connections.
2. Check procedure
Power on 30 seconds after power off.
Does communication error occurs?
Is power supplied to Inverter PCB?
Is there a problem in the connections of
communications between the outdoor unit Inverter
(CN31)
Main PCB (CN39)?
Replace the outdoor unit inverter or Main PCB.
1. If E203 Error to 7-segment of outdoor unit Main PCB is displayed,
replace the Inverter PCB and then outdoor unit Main PCB is
normal.
2. If Red - ON, Green - OFF, and Yellow - Blink are displayed in the
LED display of outdoor unit Inverter, and there is no indication in
7-segment of outdoor unit Main PCB, replace the Main PCB
The outdoor unit Inverter PCB is normal.
Yes (In case of AC023/030/040/052/060/072JX*PBH1 series,
replace the PCB, After resetting the power, reconfirm
and then close.)
Yes
Yes
MAIN MICOM (1 min.)(Error Code: E203)
No
Check the power connection and fuse.
1. Is there a problem in the power wire connection between Main
EMI PCB of the outdoor unit?
No
2. Is there a problem in power wire connection between the
Inverter
3. Is the fuse (Fuse100) of outdoor unit Inverter PCB normal?
(Short-Normal, Open-Fault)
No
Check the communication wire connections.
4-40
Main PCB (CN39)?
End the service.
EMI PCB of the outdoor unit?
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