Gree GWH(09)MA-K3DNA2B Service Manual page 47

9.2.5 E6 malfunction
Inspection
Check if connection wire between indoor and outdoor units and wire inside the unit are connected well.
Check if mainboard of indoor or outdoor unit is damaged
Flowchart
Communication malfunction of
De-energize the unit and check
if the connecting wire of indoor
and outdoor unit and wiring of
electric box are correct.
De-energize the unit. Change the communication cable
of indoor units. Energize the unit and wait for 3 min
unit resume normal?
Replace the broken-down
mainboard of the indoor unit
45
some indoor units
Is wire connected
correctly
Yes
Does the
broken-down indoor
No
End
Connect wires
No
according to the
wiring diagram
Yes
Replace mainboard
of outdoor unit
Troubleshooting
Yes
Is malfunction
removed
No