York YEHJXH024BAMT-FX - Startup Failure Diagnosis

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Malfunction indicator of outdoor unit
check points:
ly
I too much
Power on the unit
Is stop time of the compressor longer
than 3 minutes?
Restart it up after 3 minutes
Are the wires for the
compressor(UVW) connected correctly? Is
connection sequence right?
Is the charge volume of refrigerant
too much?
Connect the wires between control
panel AP1 and compressor as
per the wiring diagram
Does the unit start
up normally?
Charge refrigerant according
to the service manual
Does the unit start
up normally?
Replace the control panel AP1
End
If the fault is
eliminated?
Replace the
compressor
Fault with outdoor unit)