Gree GEH(09)AA-K3DNA1B/I, Service Manual

Page: 33 / 42

31
Troubleshooting
(2) Troubleshooting for communiction malfunction
Main check point:
Check whether the connection wire for indoor and outdoor units and the wires
inside the indoor unit is connected well;
Check whether the mainboards of indoor unit or outdoor unit are damaged;
Check flow chart:
Replace mainboard of
outdoor unit
Replace mainbaord of indoor unit
with malfunction
Wires are connected
correctly? Is malfunction
eliminate?
Connect wires according
to wiring diagram
Communication malfunction
for some indoor unit
End
Ò±
Ò±
Ò±
Ç»-
Ç»-
Ç»-
Disconnect the power, and check
connection wire for indoor and outdoor
units and wires inside electric box are
connected correctly
Whether the indoor unit
resumes normal?
De-energize the unit, exchange the communication wire
for the indoor unit with normal communication and the
indoor unit with malfunction, energize the unit and then
wait for 3mins