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
Connect wires
according to the
wiring diagram
De-energize the unit. Check if the connecting wire
between outdoor mainbaord and filter plate is correct.
Yes
No
Check if there is power input between
neutral wire and live wire of outdoor unit.
No
Yes
End
Is malfunction
removed
Yes
No
Does communication
resume normal
Is there power
in
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