First, let's see if you have chosen the wrong mode. You selected the low-temperature heating mode. If it's not a problem, it may be that the knob is not properly matched. For example, if you set the up+down heating mode, it is actually the down heating mode. If so, you can try several modes to see if there is a heating mode. If not, it is likely that the upper heating pipe is broken or the upper heating pipe is broken. At this time, it is necessary to bake the oven for after-sales service.

1, the more heating pipes in the oven, the better?

A:

Indeed, the more heating pipes, the better. The advantage of more heating pipes is that the temperature is more uniform and the food coloring will be very consistent. Some places will not be overcooked, and some places are not cooked. It depends on your financial situation. Of course, the tomato red one is more cost-effective, only over 300, and the effect is not bad. I just use the red tomato oven.