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Malfunction of
circuit is
detected with
Y
control board
AP1 voltage
If the malfunction
N
is removed?
Y
If the unit is operation
normal before malfunction
Y
Check built-
in wiring of
indoor and
outdoor unit
If the wiring is
damaged?
N
Check communication
circuit of outdoor unit
Problem of
communication
Y
circuit
N
N
Replace indoor
board
Start
Y
N
Replace outdoor
mainboard AP11
If the
malfunction is
removed?
Y
End
N
Check connection
wire of indoor and
outdoor unit with
circuit diagram
Connection
correct?
N
Check connection
wire of indoor and
outdoor unit with
circuit diagram
If the malfunction
is removed?
Y
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