The rice cooker has been used for a long time, so it's time to change it. When the rice cooker is used for a long time, the bottom heater will fail and keep warm. Moreover, if the rice cooker is not directly scrubbed with blisters after cooking, the bottom will become thinner and the heat will gradually increase. A little longer, the rice will be burnt, and there is no way to change it unless you change the bottom of the pot or buy a new rice cooker directly.