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Synchronism after
energize the unit
and start it
N
If the stop time of
compressor is more than
3min
Y
If the compressor
wire COMP(UVW) is well connected, the
connection sequence forwards to
clockwise direction?
N
Y
Connect
wire well
Replace
control board
AP1
Remove
Y
malfunction?
N
Replace
compressor
End
Synchronism
occurred during
operation
If the outdoor fan works
N
normally?
Y
If the radiating of unit is
Y
well?
N
If the input voltage of unit
N
is normal?
Y
If the refrigerant is too
Y
much?
N
Replace
control board
AP1
Remove
malfunction?
N
Replace
compressor
End
Check if the fan
terminal OFAN is
connected well
Improve the radiating
of unit (clean heat
exchanger and
increase ventilation)
Start to run until the
power resume normal
voltage
Charge the
refrigerant with
service manual
Y
Replace fan
capacitor C1
Replace
outdoor fan
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