51
Installation and Maintenance
Service Manual
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:
unit is powered on.
Out of step occurs once the
3 minutes?
Are the wires for the compressor connected
Is stop time of the
compressor longer than
Is the connection made in clockwise
correctly? Is connection sequence right?
direction?
Connect the
wires correctly
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?
Replace the
Is the outdoor unit blocked
by foreign objects?
control panel AP1
If the fault is eliminated?
Replace the
compressor
End
Remove foreign
objects
Replace the fan
capacitor C1
Check if the fan terminal
OFAN is connected
correctly
Replace the
outdoor fan
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
9. Maintenance
