25
Communication malfunction of all indoor units
De-energize the unit and check if the
connecting wire of indoor and outdoor unit
and wiring of electric box are correct.
Is wire connected correctly?
De-energize the unit. Check if the
connecting wire between outdoor
mainbaord and filter plate is correct.
Is wire connected correctly?
Is connecting wire damaged?
Check if there is power input between
neutral wire and live wire of outdoor unit.
Is there power input?
Replace mainboard of outdoor unit
Does communication resume normal?
End
Connect wires according
to the wiring diagram
Is malfunction removed?
Connect wires according
to the wiring diagram
Is malfunction removed?
Replace the connecting wire
Is malfunction removed?
Replace filter plate of outdoor unit
Is malfunction removed?
Replace mainboard of indoor unit
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Yes
No
Yes
