Download 9. Troubleshooting

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Communication malfunction
for some indoor unit
Disconnect the power, and
check connection wire for indoor
and outdoorunits and wires inside
electric box areconnected
correctly
Connect wires
according to wiring
diagram
No
Wires are connected
correctly?
Yes
Is malfunction
eliminate?
No
Yes
De-energize the unit, exchange the communication
wirefor the indoor unit with normal communication
and the indoor unit with malfunction, energize the
unit and thenwait for 3mins
Whether the indoor unit
resumes normal?
Yes
Replace mainboard of
outdoor unit
No
Replace mainbaord of indoor
unit with malfunction
End