Haier AV10IMWEWA Design, Installation & Maintenance Instruction page 270

[40] high pressure protection
if characteristic of
high pressure sensors
are normal
yes
if stop valve opens fully
yes
if in cooling outdoor
fan motor runs normally
yes
if in heating indoor
fan motor runs normally
and if filter is clogged
no
check if piping system is
clogged
no
replace pressure sensor
no
open stop valve
no
check fan motor
yes
check indoor
yes
clear the piping
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