Technical Information
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7. Communication malfunction (AP1 below is control board of outdoor unit)
Main detection point:
• Check if the connection wire and the built-in wiring of indoor and outdoor unit is connected well and no
damaged;
• Is the communication circuit of indoor mainboard damaged? Is the communication circuit of outdoor
mainboard (AP1) damaged
Malfunction diagnosis process:
Start
NO
Is the unit operation normal
before malfunction
Check built-in wiring
of indoor and
outdoor unit
Check communication
circuit and
outdoor unit
Is wiring damaged?
Problem of
communication circuit
End
NO
Malfunction of
circuit is detected
with control board
AP1 voltage
Has malfunction
been removed?
Replace the
indoor board
Replace outdoor
mainboard AP11
Check connection wire
of indoor and outdoor
unit with circuit diagram
Is the malfunction
removed?
Connect correct?
Check connection wire
of indoor and outdoor
unit with circuit diagram
Has malfunction
been removed?
NO
NO
YES
YES
YES
YES
NO
YES
NO
NO
YES
