I put the oven through a self clean cycle last Saturday. On Sunday my wife used the oven to bake a pie and while it was baking we heard a buzzing sound that we hadn't ever heard before until we turned off the oven. Yesterday we use the oven to reheat some food and it seem that no matter what temp you put the oven at the elements were bright red in the convection mode and the temp was very high (no buzzing this time). Today my wife used the oven again to bake and the oven wouldn't heat up enough to bake the item. In the bake mode the lower element does seem to heat up, in convection mode the oven gets hot but the bake element doesn't turn red at all. In the broil mode the element does get bright red and seem to work properly.

Any ideas on what you think could be the problem? Selector switch? Heating element?

Thanks.