1. The connection wire of the heater is loose, or the internal circuit has poor contact, resulting in the heater being unable to operate.
2. The fuse inside the heater system is heated and deformed, causing the heater system to fail to work properly.
3. The sleeve of the heater point motor has been running for a long time without being replaced, resulting in poor working condition.
4. Find the plug, unplug it and plug it in a few times, and at the same time rub off the food contacting the head piece to achieve good contact.