Gree GWHD14NK3BO Service Manual page 72

Troubleshooting
All the indoor units appear
communication malfunction
De-energize,check the connection
wire of indoor and outdoor unit and
the wire of the eletric box is
connected correctly
Connected correctly?
De-energize, check if the connection wire between
the outdoor mainboard and the filter board
according to the wiring diagram
Connected correctly?
The connection wire is broken?
Check if there is power input
bewtween the netrual wire and live
wire of the outdoor mainboard
There is power input?
Replace the outdoor
mainboard
Resume communication?
70
no
yes
no
yes
no
no
yes
no
yes
End
Reconnect according to
the wiring diagram
Reconnect according to
the wiring diagram
yes Replace the
connection wire
Replace the filter board of
the outdoor unit
Replace indoor
mainboard
Eliminate the malfunction
yes
Eliminate the malfunction
no
yes
Eliminate the malfunction
no
yes
Eliminate the malfunction
no
yes