My Kenmore Microwave Hood Combination Model 85470/85479/85473 stopped heating my food. The microwave runs, but does not heat anything. Why is this happening?

Owner Manual
Manual Kenmore Elite Microwave hood combo 72186013010

I don't know of anyway to repair the keypad. Usually replacement (of the keypad/control console) is the only option. But you might want to remove the ribbon cable that connects the keypad to the control board behind it, clean it with a degreaser (like Fantastic or 409), dry it, and re-insert it, and then try again. (Remember to unplug the microwave oven first before you try that!)

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Usually that is a sign that your magnetron tube has gone bad (shorted out).

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you may find the old unit was lower watts so took longer & cooked/heated better all the way through. a way to fix this is lower temp settings or pause and stir the food to help heat it up more even.

What make and model is it?

There are three common issues, the magnetron "heats food" a cracked high voltage diode, a shorted high voltage capacitor.

Magneto or magnatron has gone bad. This is the part that sends the waves through the food to heat it.

Dave

When I try and heat some food, the microwave runs but doesn't heat anything, its a model wes1450dm1bb

Check those three microswitches in the latch assembly.

I'm assuming that it doesn't microwave either. If it does...then the heater is bad. Sears parts sells them. Second guess is a blown fuse or thermosensor. Inside the pad housing, locate the internal fuse and replace it if blown. The thermosensor is a black plastic bit about the diameter of a dime and 3/8 inch thick and clamped to the side of the unit inside the control area. Test it for continuity and replace if open. If not either of these, then you have power supply issues or control panel problems. My bet: the heater blew out. Often, this is caused when you heat greasy foods.