Common oven and stove top problems include...
Oven does not heat or cooks inconsistently
Inconsistent heating or not heating at all could suggest a faulty thermostat or a broken element in the oven.
Door not sealing properly
If the door seal is worn or damaged, then your oven door may not seal properly which could lead to food not cooking properly.
Elements are not heating up
There could be a problem with one element that needs replacing or the electrical system might need looking at. If you have a gas cooktop it may be a problem with the ignitor.