Present image Principle deal with No power 1. The socket has no power Change socket 2. The plug is not plugged in or disconnected 2. Plug in the plug or connect the cable 3. Fuse open circuit 3. Replace the fuse 4. The power switch is not closed. 4. Close the power switch 2. The temperature inside the box does not rise 1. Set the temperature low 1. Adjust the set temperature 2. Electric heater is bad 2. Electric heater 3. The temperature controller is bad 3. Change the temperature controller 4. The Temperature Sensor cable is loose 4. Tighten the sensor cable nut 3. Set the temperature and the temperature error in the box is large 1. Temperature sensor is bad 1. Change temperature sensor 2. High ambient temperature (over 30 °C ) 2. Use in an air-conditioned environment 4. Temperature is out of control 1. The temperature sensor is fixed off Fixed temperature sensor 2. The temperature controller is bad, the thyristor is bad. 2. Change the temperature controller, thyristor Multi-Pass Cock Valve,Cock Valve,Pressure Cock Valve Zhejiang Hisern Medical Technology Co., Ltd , https://www.hisernmedical.com