Gree GWH18TC-S3DNA1D Service Manual page 71

4. Communication malfunction E6
Cut off power supply. Check if
connection line of IDU and ODU
and the wire inside electric box
are correctly connected.
Correct connection?
Main board matches
with display board? Main board of
IDU matches with that of ODU?
Communication cord is damaged?
Malfunction eliminated?
68
Start
no
yes
yes
no
Replace IDU's
main board
yes
End
Connect the line
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?
yes
Malfunction eliminated?
yes
Malfunction eliminated?
Installation and Maintenance
Service Manual
yes