3. Heating mode: When the detected temperature is less than or equal to the starting temperature, the relay is turned on, the red indicator light is on, and the heating equipment starts to work; When the detected temperature ≥ the stop temperature, the relay is turned off, the red indicator light is off, and the heating equipment stops working 1. Automatic identification of working mode: The system automatically recognizes the working mode according to the temperature/stop temperature; temperature stop temperature, cooling mode 'C'; temperature Less than stop temperature, heating mode 'H'; 2. Cooling mode: When the detected temperature is or equal to the starting temperature, the relay is turned on, the red indicator light is on, and the refrigeration equipment starts to work; When the detected temperature is less than or equal to the stop temperature, the relay is turned off, the red indicator light is off, and the refrigeration equipment stops working; 4. Temperature correction function OFE (-10.0 ~ 10.0℃): When the system works for a long time, there may be deviations, which can be corrected by this function, the actual temperature = measured temperature + calibration value;