Why doesn't my oven heat up

It could be the switch or heating element

I would check the heating element assuming this is an electric.

What is the model number of the unit?

Heating element going bad!

Sounds to me like the lower element shorted and tripped the breaker as it burned out. If you're handy at electrical troubleshooting that's where I'd start - comparing ohmmeter readings between the bad element and the one that works.

A wire short to the chassis would have a similar set of symptoms and be easier to find and fix.

Beyond that, you need a service tech.

We have had the same issue, it drove me crazy.... Ours has just stopped working altogether now.

ISOLATE THE MAINS POWER BEFORE CHECKING THE APPLIANCE
Run your fingers along the grill element, in this model it is accessible, check for raised areas or small hole or roughness not food burnt, if visible, it should be Black Grey colour at the blemish, you can obtain parts from www.whitegoods.co.uk you will need the model and serial numbers.
The grill elements come out but when unsrewed sometimes the ceramic holders crack, remove element before ordering as you may have to replace the element holders.
Hope this has been helpful
john

Hello,

There are a number of reasons why you may find that your oven doesn't heat up, and troubleshooting oven heating elements is not too complicated, so you should be able to manage this in a few hours. When you are trying to decide what is the cause of your oven not heating up properly, you should be able to identify the different problems, and also understand how to repair the oven without too much difficulty. If you find a lot of problems, then you may need to provide a different solution, for example replacing the heating element and fittings completely.
Heating Element is Broken
This is perhaps the most common cause of the oven not heating up. The element inside the oven will not become hot if the electrical connections are damaged, or if the element itself is not working. The heating element can be removed and replaced easily, and this is perhaps a very good idea if you have any problems with the heating system of your oven. Test the heating element by firing up the oven with the door open, and your hand close to the front of the element. You should be able to feel it warming up, so if it doesn't, take of the screws which hold it in place, and then unplug the connections. You can take the heating element to a store and they should be able to replace the part for you.

Hope this help in solving the problem.....

whirlpool oven doesn"t heat after self cleaning.

When you say the oven doesn't want to turn on are you referring to the control board wont turn on? Or are you saying that the oven wont heat when it gets too hot?