Circuit problems or broken parts. If the oven makes a slight beeping sound and is running normally, it is the sound of the timer, which is a normal phenomenon. If it beeps but does not light up, there is a problem with the circuit or the oven parts are broken. Toshiba's water wave oven is an "oven" born in Japan. It uses water vapor above 250°C - "superheated steam" to cook food. This is the biggest feature of the water wave oven. The higher temperature can effectively remove fat and reduce salt. You eat healthier, and its functions are integrated into one, making it not just a simple oven, but a superheated steam oven that integrates functions such as micro-steaming and baking.