Toyotomi KURO Mini Service Manual page 102

All the indoor units appear
communication malfunction
De-energize,check if the connection
wire of indoor and outdoor unit and
the wire of the eletric box is
connected correctly
Connected correctly?
De-energize, check if the connection wire between
the outdoor mainboard and the filter board
according to the wiring diagram
Connected correctly?
The connection wire is broken?
Check if there is power input
bewtween the netrual wire and live
wire of the outdoor mainboard
There is power input?
Replace the outdoor
mainboard
Resume communication?
36
No
Yes
No
Yes
Yes
No
Replace the filter board of
No
Yes
No
Yes
End
Reconnect according to
the wiring diagram
Reconnect according to
the wiring diagram
Replace the
connection wire
the outdoor unit
Replace indoor
mainboard
Eliminate the malfunction
Eliminate the malfunction
Yes
No
Eliminate the malfunction
Yes
No
Eliminate the malfunction
Yes
No
Installation and Maintenance
Service Manual
Yes