Airwell YEVFD Series, Service Manual

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Check if high/low pressure
sensor is connected well
Check if compressor wire is
connect normally
If wires of inverter compressor
are connected oppositely
If 4-way valve is interconnected
Measure if there is voltage U, V, W
of compressor by multimeter, and
if it is normal
Replace inverter compressor
Re-connect
Correct compressor wire
Correct compressor wire
Replace 4-way valve
Replace inverter module
No
No
No
No
No
Yes
Yes
Yes
Yes
[75] No pressure drop between high pressure and low one
71