129
[39-0, 39-1] Low pressure too low(Ps)/compression ratio too high
Replace pressure sensor
If actual pressure is in
conformance with the measured
data by sensor
Check if stop valve is open fully
Check if system is lack of
refrigerant
Check if terminal of electronic
expansion valve coil is fixed well
Check if piping system is
clogged
Open stop valve
Recharge refrigerant
Re-connect the terminals
Clear the piping
N
Y
Y
N
Y
N
Y
N
Y
