Maintenance method: 1. Check whether the power socket of the rice cooker is plugged in properly. 2. Plug in the power of the rice cooker. If the relay on the power board has a pull-in sound but has not been separated for a long time, then its power board needs to be replaced during maintenance. 3. If there are sundries in the inner pot or heating plate, it is necessary to clean the inner pot, heating plate and sensor.