Low-pressure failure has a variety of possibilities, the following list of common situations:

1, low-pressure switch failure or controller interference resulting in false alarms.

2, the indoor machine filter is dirty and clogged, resulting in insufficient evaporative air volume.

3, indoor fan failure, shutdown or speed drop.

4, temperature set point error, return air temperature is too low.

5, the return liquid pipeline compression caused by the return liquid is not smooth.

6, filter drier dirty plug or copper pipe piping oil plug.

7, solenoid valve can not open, expansion valve failure.