6TQWDNGUJQQVKPI
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
˛
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
input?
Replace filter plate of
outdoor unit
Replace mainboard of outdoor unit
Is wire connected
correctly
˛
Replace mainboard
of indoor unit
Is connecting wire
damaged
˛
Replace the
connecting wire
Connect wires
according to the
wiring diagram
Yes
No
Yes
No
No
Yes
Yes
No
No
Yes
Yes
No
Is malfunction
removed
˛
Is malfunction
removed
˛
Is malfunction
removed
˛
