Gree GVH24AK-K3DNC8A Service Manual page 63

7. Communication Malfunction
Outdoor unit malfunction indicator status
D5 D6
□ □
Main detection point:
●Check if the connection wire and the built-in wiring of indoor and outdoor unit is connected well and no damaged;
●If the communication circuit of indoor mainboard is damaged? If the communication circuit of outdoor mainboard (AP1) is damaged?
Malfunction diagnosis process:
N
Connectwire of indoor
and outdoor unit
according to
circuit diagram
N
If the malfunction
is removed ?
60
D16 D30
□ ☆
Y
Check if the controller connection
wire inside indoor and outdoor
electric box is loose
If the connection wire
is normal?
Y
Check communication
circuit of outdoor unit
Problem of
communication
circuit
N
Replace indoor
mainboard
Y
Start
If the unit is operating
normally before malfunction
Y
Replace outdoor
Y
mainboard (AP1)
If the
malfunction is
removed?
Y
End
Service Manual
N
Check connection wire
of indoor and outdoor
unit with circuit diagram
Connection
correct?
N
N
Connect wire of indoor
and outdoor unit
according to
circuit diagram
If the malfunction
is removed?
Y
Installation and Maintenance