Gree GWH09AB-A3DNA1B Service Manual page 57

Troubleshooting
(5) Out of step diagnosis for the compressor (AP1 hereinafter refers to the control board of the outdoor unit)
Mainly detect:
Whether the system pressure is too high?
Whether the input voltage is too low?
Fault diagnosis process:
Out of step occurs once the
unit is powered on.
Is stop time of the
compressor longer than
Are the wires for the compressor connected
correctly? Is connection sequence right?
Is the connection made in clockwise
Connect the
wires correctly
Replace the control
If the fault is eliminated?
3 minutes?
direction?
panel AP1
Replace the
compressor
End
Out of step occurs in
operation
Is the outdoor fan working
normally?
Is the outdoor unit blocked
Remove foreign objects
by foreign objects?
Replace the
control panel AP1
If the fault is eliminated?
Replace the
compressor
End
54
Check if the fan terminal
Replace the fan
OFAN is connected correctly
capacitor C1
Replace the
outdoor fan