Haier MRV S II - Low Pressure too Low and Compression Ratio too High; Compression Ratio too Low

6565
Troubleshooting
If actual pressure is in
conformance with the
measured data by sensor
Check if compressor
running current is normal
Check if 4-way valve
is interconnected
Replace pressure sensor
Check compressor
Replace 4-way valve
No
No
Yes
Yes
Yes
If actual pressure is in
conformance with the
measured data by sensor
Check if terminal of
electronic expansion
valve coil is xed well
Check if piping
system is clogged
Check if system is
lack of refrigerant
Check if stop valve
is open fully
Replace pressure sensor
Open stop valve
Recharge refrigerant
Re-connect the terminals
Clear the piping
No
No
No
No
Yes
Yes
Yes
Yes
Yes
[39-0, 39-1] Low pressure too low and compression ratio too high
[39-2] Compression ratio too low