46
Installation and Maintenance
Service Manual
8. Communication malfunction
Main checking points:
If the indoor mainboard or outdoor main board is broken;
If the connection wire between the indoor unit and outdoor unit is connected well, if the wires inside the unit is connected well;
Flow chart:
Eliminate the malfunction
End
Communication malfunction of some
indoor units
De-energize,check if the connection
wire of indoor and outdoor unit and
the wire of the eletric box is
connected correctly
Connected correctly
Reconnect according to
the wiring diagram
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 outdoor
mainboard
Replace the mainboard of the
malfunction indoor unit
No
No
No
Yes
Yes
Yes
