Gree GWH18MC-K3DNA2G Service Manual page 53

(5) Communication malfunction (E6)
50
Troubleshooting for E6
malfunction
Disconnect power and check if
the connection wire of indoor
and outdoor units and the
built-in wire of electric box are
correctly connected.
Correct connection?
Yes
Main board matches with display
board? Main board of IDU
matches with that of ODU?
Yes
Connection of communication
wire is damaged or not?
No
Replace the main
board of IDU.
Is malfunction
eliminated?
Yes
End
Connect the wire
properly according
No
to the wiring
diagram.
No
Match correctly
according to
No
product
specification.
No
Replace the
Yes
connection wire.
No
Replace the main
No
board of ODU.
Service Manual
Is malfunction
eliminated?
Is malfunction
Yes
eliminated?
Is malfunction
Yes
eliminated?
Yes
Installation and Maintenance