Reseating the Element
The broiler is heated using an electric element which should be clipped in to the top of the broiler enclosure. If this has come loose then it might not be making contact with the necessary terminals. Try to reseat the terminal but before doing so you must ensure that the electricity is turned off.
Testing the Element
The element is what heats up and cooks the food in the broiler. Over time the heat can damage the broiler element. These elements are supported by stand-offs and if the element burns out or becomes damaged then this can be a common reason why the broiler isn't working.
The easiest way to test whether this is working is to turn the broiler on and look at the element. If it is working correctly then the element should be glowing red.
Another slightly more complicated test for the broiler element is to remove the element from the oven and disconnect it. Then use a multimeter to check the continuity of the element. Set the multi-meter to measure resistance and then put it either side of the element. The normal measurement should be between 20 and 40 ohms. If the element is infinitely resistant then this means it's broken and will need to be replaced.
Testing Oven Controls
Another reason why the broiler will fail to work is because of problems with the oven controls. A thermostat is used to set the temperature of the broiler, and the oven selector controls are used to control the setting of the broiler.
Turn the oven controls on to see whether the broiler is working properly. If not the controls can be removed and tested using a multimeter. Check the outputs to ensure that the controls are working correctly.
These can also be replaced if required by fitting a replacement part designed specifically for your oven.
Read More: Troubleshooting an Oven Broiler Doesn Work