SERVICE MANUAL
R
−
410A Ductless Split System: DLF4(A/H), DLC4(A/H)
421 08 9204 00
77
(7) Communication malfunction
Outdoor unit malfunction indicator status
D5
D6
D16
D30
Detection:
Check if the connection wire and the built
−
in wiring of
indoor and outdoor unit is connected and not damaged;
If the communication circuit of indoor mainboard is
damaged? If the communication circuit of outdoor
mainboard (AP1) is damaged?
Malfunction diagnosis process:
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
Connect wire of indoor
and outdoor unit
according to
circuit diagram
N
If the malfunction
is removed ?
Y
N
