Gree GWH12MB-K3DNE3G Service Manual page 53

12.Communication malfunction (E6)
Main detection points:
● Check if the connection wire and the built-in wiring of indoor and outdoor unit are connected well and without damage;
● If the communication circuit of indoor mainboard is damaged? If the communication circuit of outdoor mainboard (AP1) is damaged?
Malfunction diagnosis process:
Replace the
wire
Is the malfunction
eliminated?
50
If the unit operates normally
before malfunction
Check built-in wiring
of indoor and outdoor
unit
If the wiring is
damaged?
Check the malfunction
type with communication
malfunction detector
Malfunction of outdoor
communication circuit
Replace indoor
mainboard AP2
E6
Replace outdoor
mainboard AP1
Is the malfunction
eliminated?
End
Service Manual
Check the connection
wire according to the
wiring diagram.
If the connection wire
is connected well?
Reconnect the wire or
replace the connection
wire according to the
wiring diagram.
Is the malfunction
eliminated?
Installation and Maintenance