Gree GWH09UB-K6DNA4A Service Manual page 59

5. Communication Malfunction E6
56
Start
Cut off power supply. Check if
connection line of IDU and ODU
and the wire inside electric box
are correctly connected.
Correct connection?
Yes
Main board matches
with display board? Main board of
IDU matches with that of ODU?
Yes
Communication cord is damaged?
No
Replace IDU's
main board
Malfunction eliminated?
Yes
End
Connect the line
No
according to
wiring diagram.
No
Match correctly
no
according to product
specification
No
Replace
Yes
communication
cord
No
Replace ODU's
No
main board.
Malfunction eliminated?
Malfunction eliminated?
Yes
Malfunction eliminated? Yes
Yes
Installation and Maintenance
Service Manual