Gree GWH18MC-K3DNA2G Service Manual page 62

Service Manual
(8) Malfunction of Communication (E6)
Main check point:
Check whether connection wires between indoor unit and outdoor unit and wiring inside the unit are connected well?
Check the main board of indoor unit or main board of outdoor unit is damaged?
Check flow chart:
Communication malfunction
De-energize the unit and then
check whether connection wires
between indoor unit and outdoor
unit and wiring inside the electric
box are correct
Are wires are connected correctly?
Yes
Replace main board of indoor unit
Is malfunction eliminated?
Yes
Installation and Maintenance
No
No
End
Connect wire correctly
according to circuit
diagram
Replace main board
of outdoor unit
Is malfunction eliminated?
No
Yes
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