Troubleshooting For Communication Malfunction - Toyotomi KURO Mini Service Manual

Communication malfunction
for some indoor unit
Disconnect the power, and
check connection wire for indoor
and outdoorunits and wires inside
electric box areconnected
correctly
Wires are connected
correctly?
Yes
De-energize the unit, exchange the communication
wirefor the indoor unit with normal communication
and the indoor unit with malfunction, energize the
unit and thenwait for 3mins
Whether the indoor unit
resumes normal?
No
Replace mainbaord of indoor
unit with malfunction
End
Connect wires
No
according to wiring
diagram
Yes
Replace mainboard of
outdoor unit
Yes
Is malfunction
eliminate?
No