Gree GEH09AA-K3DNA1B Service Manual page 48

Service Manual
(2) Troubleshooting for communiction malfunction
Main check point:
●Check whether the connection wire for indoor and outdoor units and the wires inside the indoor unit is connected well;
●Check whether the mainboards of indoor unit or outdoor unit are damaged;
Check flow chart:
Communication malfunction
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
Whether the indoor unit
Replace mainbaord of indoor
unit with malfunction
Installation and Maintenance
for some indoor unit
Wires are connected
correctly?
Yes
Yes
resumes normal?
No
End
Connect wires
No
according to wiring
diagram
Replace mainboard of
outdoor unit
Yes
Is malfunction
eliminate?
No
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