Troubleshooting
Mainly detect:
Detect the indoor and outdoor units connection wire and indoor and outdoor units inside wiring is connect well or not, if is there any damage?
Is there any damage for the indoor unit mainboard communication circuit? Is communication circuit damaged? The flow chart for malfunction detect:
Start
Did the equipment operate
normally before the failure
Yoccurs?
N
Check the wiring of the indoor and
outdoor units with reference to the wiring diagram
The AP1 voltage detection circuit 
is at fault
If the fault is eliminated?
Y
N
Check wiring inside of
the indoor and outdoor 
Y
units 
N
Are wires broken?
N
Check the communication circuit of the outdoor unit
The communication |
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circuit is abnormal |
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| AP1 of the outdoor unit | |||||||
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Replace the main board |
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of the indoor unit |
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Is the connection right?
N
Correctly connect the corresponding wires for the indoor and outdoor units with reference to the wiring diagram
If the fault is eliminated?
Y
Y
End 
Y
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