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(7) Communication malfunction
Main checking points:
●
If the connection wire between the indoor unit and outdoor unit is connected well, if the wires inside the unit is
connected well;
●
If the indoor mainboard or outdoor main board is broken;
Communication malfunction
of some indoor units
De-energize, check the
connection wire of indoor
and outdoor unit and the
wire of the electric box is
connected correctly
Connected correctly
De-energize, change the
communication wire of the
well communicated indoor
unit and malfunction
indoor unit, then energize
the unit and wait for 3min
The malfunction indoor
unit resumes normal
Replace the mainboard of
the malfunction indoor unit
End
Reconnect according
to the wiring diagram
Eliminate the malfunction
Replace outdoor
mainboard
No
No
No
Yes
Yes
Yes
