This microwave continues to run when the door is open. This happens after multiple uses for a longer period of time. Trying to decide if it is worth repairing, have read it might be a cheap door switch or an expensive motherboard. Any suggestions?

Hi, my microwave was new when we purchased our home 3yrs ago. The microwave began to blow a fuse within the microwave about a yr ago. My husband figured it was due to grease build up inside. He would take the top panel off and then remove the fuse and wipe any access grease around the fuse, but this only seemed to be a quick temporary fix. He would change the fuse 4-5 times a month. We haven't used the microwave in a few months because of the fuses blowing so much and i am afraid of electrical fires. There is so much grease build up it runs from under the top panel i am constantly cleaning it. What could be causing this problem? What would you recommend? Do we need to purchase another microwave? Any advice is much appreciated. Thanks in advance!

I have a Frigidaire over the counter microwave which suddenly stopped working. Immediately after i press start button, it trips my circuit. Light and exhaust works without any problem. Please help.