Sometimes the electrical components in the oven can break so that they aren’t able to transmit the right signal to the heating elements in the oven. The switch that ignites the broiler element may be working, but the switch that operates the other heating element may not turn on. The actual physical switch to turn the oven on may also be broken.
The other heating element in the oven may be chipped, split or broken and, as such, it no longer works. You can easily replace this by unscrewing it from the oven and pulling it from the terminals. Press the replacement heating element into the terminal and secure it to the oven by replacing the screws.
The thermostat senses the oven’s temperature and turns the heating elements on and off to keep a consistent temperature. If the thermostat is broken, it may be registering a high temperature and sending a signal to the heating elements to turn them off.
Most often, if your heating element worn turn on, but your broiler will turn on, it is because the igniter is broken on that specific heating element. The igniter is the component that actually causes the element to glow. Generally, these mechanisms will weaken before they break. So, if you notice that the element only turns yellow or orange, rather than bright red, it is a sign that it is weakening and may soon need replacement.