Front panel all works fine. When I set the timer, press start, the light on the inside doen not come on and no microwave is running. Just the timer starts counting down. When the timer hit 0, it beeps. If I press the opening button slightly, the light on the inside doen come on and microwave is running. I need to press the button all the time. If I press the button hard the door opens and if I press the button less, only timer works.

I found that the one of the interlock switch is mal-functioning. I ordered the part and hope it solved the problem.