Daikin FTXV25AV1B Service Manual page 58

Troubleshooting
(4) Communication malfunction
Disconnect power and check if
the connection wire of indoor
and outdoor units and the
built-in wire of electric box are
correctly connected.
Correct connection?
Main board matches with display
board? Main board of IDU
matches with that of ODU?
Connection of communication
wire is damaged or not?
Replace the main
board of IDU.
Is malfunction
eliminated?
50
Start
no
yes
yes
no
no
yes
End
Connect the wire
properly according
to the wiring
diagram.
no
Match correctly
according to
no
product
specification.
no
Replace the
yes
connection wire.
no
Replace the main
board of ODU.
Is malfunction
eliminated?
Is malfunction
yes
eliminated?
Is malfunction
yes
eliminated?
Troubleshooting
SiK011003
yes