Gree GWH09ACC-K6DNA1F/I Service Manual page 76

5. Out of step diagnosis for the compressor (AP1 hereinafter refers to the control board of the outdoor unit)
Mainly detect:
●Is the system pressure too high?
●Is the input voltage too low?
Fault diagnosis process:
Out of step occurs once the
No
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
No
Connect the
wires correctly
control panel AP1
Yes
If the fault is eliminated?
Installation and Maintenance
unit is powered on.
3 minutes?
Yes
direction?
Yes
Replace the
No
Replace the
compressor
End
Out of step occurs in
operation
Is the outdoor fan working
normally?
Yes
Yes
Is the outdoor unit blocked
by foreign objects?
No
Replace the
control panel AP1
If the fault is eliminated?
No
Replace the
compressor
End
Check if the fan terminal
No
OFAN is connected
correctly
Remove foreign
objects
Yes
Replace the fan
capacitor C1
Replace the
outdoor fan
73