KitchenAid Microwave Repair
The microwave oven sounds okay, but it does not produce heat
This particular kind of KitchenAid microwave repair probably requires a qualified repair technician.
This issue of where the microwave unit sounds like it's working, but it does not heat, could be caused by a number of problems. One of the internal door switches might be defective, the high voltage circuitry could be faulty, or the circuit board may have a problem.
It is safest in this case to have an expert diagnose the problem.