usually, the battery furnace displays the fault code EO, which means that the machine cannot detect that there is a pot. One common reason is that the pot does not meet the requirements, so it is best to use the pot brought by the manufacturer. Second, the boiler inspection voltage is low or disappears, and the vulnerable components have two 2-watt resistors, which are about 33 kiloohms to 56 kiloohms. The unusual fault component is LM339. If the above components are all right, don't waste time checking the faulty machine.