Haier AU052FPERA - [75-0, 75-4] Pressure difference between high pressure and low pressure is abnormal

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[75-0, 75-4] Pressure difference between high pressure and low pressure is abnormal
Check if high/ low pressure
sensor is connected well
Check if compressor wire is
connected normally
If wire 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
No
Yes
Yes
Yes
Yes