The light is not on, but it is ticking; 1, the sound of the oven shell. The metal plate will expand and contract due to the heat generated by the internal temperature rise, thus making a sound, and the effect will be better after several times.
2. The sound of the timer. Some oven timers will tick, which is normal.
3. The sound of oven parts working. When the oven parts are running, they sometimes make a little noise, which is normal and can be used with confidence.