Low Pressure Too Low And Compression Ratio Too High; Compression Ratio Too Low - Haier InoSens MRV SI AU032FSEUA Service Manual

[39-0, 39-1] Low pressure too low and compression ratio too high

If actual pressure is in
conformance with the
measured data by sensor
valve coil is fixed well

[39-2] Compression ratio too low

If actual pressure is in
measured data by sensor
running current is normal
Yes
Check if stop valve
is open fully
Yes
Check if system is
lack of refrigerant
No
Check if terminal of
electronic expansion
Yes
Check if piping
system is clogged
conformance with the
Yes
Check if compressor
Yes
Check if 4-way valve
is interconnected
No
Replace pressure sensor
No
Open stop valve
Yes
Recharge refrigerant
No
Re-connect the terminals
Yes
Clear the piping
No
Replace pressure sensor
No
Check compressor
Yes
Replace 4-way valve
66