Gree GWH09RB-K3DNA2C Service Manual page 68

Troubleshooting
(5) Out of step diagnosis for the compressor (AP1 hereunafter refers ti the control board of the outdoor unit)
Main detect:
Whether the system pressure is too high?
Whether the input voltage is too low?
Are the wires for the compressor connected
correctly? Is connection sequence right?
Is the connection made in clockwise
Connect the
wires correctly
Out of step occurs once the
unit is powered on.
Is stop time of the
compressor longer than
3 minutes?
direction?
Replace the control
panel AP1
If the fault is eliminated?
Replace the
compressor
End
Out of step occurs in
operation
Is the outdoor fan working
normally?
Is the outdoor unit blocked
by foreign objects?
Replace the
control panel AP1
If the fault is eliminated?
Replace the
compressor
End
Check if the fan terminal
OFAN is connected correctly
Remove foreign objects
Replace the fan
capacitor C1
Replace the
outdoor fan
65