Malfunction Checking And Elimination - Gree Multi+ Ultra MULTIU18HP230V1DO Service & Parts Manual

9.2 Malfunction Checking and Elimination

Malfunction display: E6 Communication malfunction
Communication malfunction of some
indoor units
De-energize,check the connection
wire of indoor and outdoor unit and
the wire of the eletric box is
connected correctly
Connected correctly
Y
De-energize, change the communication wire of the well-
communicated indoor unit and malfunction indoor unit,
then energize the unit and wait for 3min
The malfunction indoor unit
resumes normal
Replace the mainboard of the
malfunction indoor unit
30
N
Y
N
End
Reconnect according to
the wiring diagram
Replace outdoor
mainboard
Eliminate the malfunction
N
Installation and Maintenance
Service Manual
N