7URXEOHVKRRWLQJ
Y
N
N
N
Y
Y
Y
N
Y
N
N
Y
Y
N
N
Y
Finish
Finish
Losing synchronism
upon startup of
the unit
Losing synchronism
during running
Is the stop time
of compressor
more than 3min
Is outdoor fan normal?
Is fan well
connected?
Is wire of compressor(U,V,W)
well connected?
Is outdoor
fan blocked by stuff?
Remove staff
Reliable connected?
Remove error?
Remove error?
Remove error?
Replace
compressor
Replace
compressor
Replace
outdoor fan
Replace parts of
outdoor electric
box
Replace parts of
outdoor electric
box
Replace parts of
outdoor electric
box
Adjust
connecting wire
(4)Diagnosis of losing synchronism for compressor
Main detection point:
● Is pressure of the system too high?
● Is voltage too low?
Malfunction diagnosis process:
