fan works, but oven won't heat up?

almost certain to be the fan element ( as long as the temp indicator light comes on ) You don't list a model but generally remove the rear panel inside the oven, the element is the dull metal circle around the fan held on with 2 screws and one support. remove screws and gently pull element towards you taking care not to loose the wires back through the holes ! replace and rebuild. As always make sure the powers off before doing anything !

Jim
February 2012