Low pressure protection
Yes
Use a pressure gauge to
measure whether the pressure is low
pressure indeed
Check if there is refrigerant leakage
in the system
Yes
Check if short circuit occurs to
the main board protection interface
and if protection still exits
Yes
The main board is damaged.
Replace the main board
No
Check if the pressure switch is
damaged
Yes
Replace the pressure switch
Wire connection error or line
interference; check and
replace the line
No
Fill refrigerant according to the filling
amount indicated on the nameplate
Yes
Check if the expansion valve can
operate normally
Replace the coil of expansion valve or
the valve
No
Check if the temperature difference
or pressure difference before and after
the unit filter is too large
There is a component with apparent
temperature drop in the system or the pipeline
is blocked. Replace the related part
No
Yes
Yes
Filter is blocked. Replace the filter
No
Yes
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