Outlet water temperature sensor fault judgment method, emergency control method and heat pump

The invention provides an outlet water temperature sensor fault judgment method, an emergency control method and a heat pump, and relates to the technical field of heat pumps. The outlet water temperature sensor fault judgment method is applied to the heat pump, the heat pump comprises a water conveying pipeline, and a heat exchanger, an intermediate temperature sensor, an electric auxiliary heater and the outlet water temperature sensor are sequentially arranged on the water conveying pipeline in the water flow direction. The judging method comprises the steps that the intermediate water temperature detected by an intermediate temperature sensor and the outlet water temperature detected by an outlet water temperature sensor are obtained respectively; whether the outlet water temperature sensor breaks down or not is judged according to the intermediate water temperature, the outlet water temperature and a first numerical value, and the first numerical value is determined according to the detection error value