Service Manual
60
Installation and Maintenance
7. Communication Malfunction
Outdoor unit malfunction indicator status
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:
D5
D6
D16
D30
□
□
□
☆
Start
Check communication
circuit of outdoor unit
Problem of
communication
circuit
Check if the controller connection
wire inside indoor and outdoor
electric box is loose
Connection
correct?
Connect wire of indoor
and outdoor unit
according to
circuit diagram
Check connection wire
of indoor and outdoor
unit with circuit diagram
If the unit is operating
normally before malfunction
Y
N
Y
N
If the connection wire
is normal?
If the malfunction
is removed?
N
Y
Replace indoor
mainboard
Replace outdoor
mainboard (AP1)
If the
malfunction is
removed?
End
N
Y
Y
Y
Connectwire of indoor
and outdoor unit
according to
circuit diagram
N
If the malfunction
is removed ?
Y
N
