1.justa oven power socket is loose, which will cause the oven indicator light to go out. Reconnect the oven socket to the power supply and it can be used normally.

2. the LED of 2.justa oven is broken, which causes the indicator light of the oven to go out. Just change a new LED.

3. The timer or thermostat of 3.justa oven is damaged, which leads to the problem that the power light is not on. You can find professional maintenance personnel to repair at home.