Samsung AVXC1H022 series Service Manual page 316

Troubleshooting
I
: Indoor unit address setup error of MCU
Outdoor unit display
Indoor unit display
Judgment method
Causes - MCU address do not match with indoor unit address.
Find indoor unit and MCU address that
occurred communication error, through
outdoor unit PCB or MCU PCB.
Check address set matching
between indoor unit and MCU.
Are not the same between
No
indoor unit and
MCU address?
Restart after setting correctly
between indoor unit and
Yes
MCU address.
If the error is occurred again after restarting with a
change of confluence kit setup DIP switch of MCU and
indoor unit address setup, replace MCU PCB.
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