72
Installation and Maintenance
Service Manual
(4) Start-up failure (following AP1 for outdoor unit control board)
Mainly detect:
Whether the compressor wiring is connected correct?
Is compressor broken?
Is time for compressor stopping enough?
Fault diagnosis process:
Y
N
Y
N
N
Y
Y
N
Power on the unit
Is stop time of the compressor
longer than 3 minutes?
Restart it up after
3 minutes
Does startup fail?
Are the wires for the compressor connected
correctly? Is connection sequence right?
Connect the wires as
per the connection
diagram
Replace the control panel AP1
If the fault is eliminated?
Replace the
compressor
End
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