Refrigerant loss fault judgment method and device, air conditioner and computer storage medium

The invention provides a refrigerant loss fault judgment method and device, an air conditioner and a computer storage medium. The method is used for the fixed-frequency air conditioner, and comprises the following steps: (1) detecting a compressor body temperature Tcompressor, a compressor exhaust temperature Texhaust and an indoor heat exchanger coil temperature Tcoil in real time or regularly; (2) judging whether Texhaust is greater than or equal to a first preset temperature T'exhaust; (3) if yes, executing the step (4), and if no, returning to the step (1); (4) conducting calculating, and judging whether a first temperature difference value deltaT1 between Tcompressor and Texhaust is greater than or equal to a first preset temperature difference value deltaT'1 according to a formula that deltaT1=Tcompressor-Texhaust; (5) if yes, executing the step (6), and if no, executing the step (7); (6) shutting down a compressor, and making the air conditioner display a refrigerant loss fault code; and (7) returning