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Technical Information
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
unit is powered on.
NO
Is stop time of the
compressor longer than
3 minutes?
Are the wires for the
compressor connected
correctly? Is connection
sequence right?
Is the connection made in
clockwise direction?
Is fault is eliminated?
Replace the control
panel AP1
Replace the compressor
End
YES
YES
Connect the
wires correctly
NO
Out of step occurs in
operation
NO
Is the outdoor fan
working normally?
Is the outdoor unit
blocked by foreign
objects?
Is fault is eliminated?
Replace the control
panel AP1
Replace the compressor
End
NO
YES
Check if the fan
terminal OFAN
is connected
correctly
Replace
the fan
capacitor
C1
Remove foreign
objects
Replace the
outdoor fan
YE
S
