Haier AV10IMWEWA Design, Installation & Maintenance Instruction page 269

[39-0, 39-1] low pressure too l o w and compression ratio too high
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
[39-2] compression ratio too low
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
yes
yes
no
yes
yes
yes
268
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