31
Installation and Maintenance
Service Manual
(2) Troubleshooting for communiction malfunction
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Replace mainboard of
outdoor unit
Wires are connected
correctly?
Is malfunction
eliminate?
Communication malfunction
for some indoor unit
End
No
No
No
Yes
Yes
Yes
Whether the indoor unit
resumes normal?
Disconnect the power, and
check connection wire for indoor
and outdoorunits and wires inside
electric box areconnected
correctly
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
Replace mainbaord of indoor
unit with malfunction
Connect wires
according to wiring
diagram
