The reason for not heating may be that the heating plate is burnt out or the circuit is damaged, or the heating element is broken.

See if there is any heating adjustment on the switch of the health pot. If there is no heating adjustment, the switch will be broken. The switch is broken, and the indicator light is still on. Because the indicator light is on, it is known that there is a power supply that does not drive the heating pipe and needs to be connected, so there is no obvious reason not to heat it.