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55
If characteristic
of high pressure
sensors are normal
If in cooling
outdoor fan motor
runs normally
If stop valve
opens fully
If in heating indoor fan
motor runs normally
and if filter is clogged
Check if piping
system is clogged
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Replace pressure sensor
Open stop valve
Check fan motor
Check indoor
Clear the piping
[40] High pressure protection