Chosen Solution
Ok so I’ve been dealing with a microwave where the normally open switch keeps fusing together and triggering the breaker when pulling the door open. So I’ve been tinkering with the switch each time and “unfusing” it when it does that. Most of the time after “fixing” it the wife just presses off before opening it to prevent the switch fusing together and that’s works. Except for the rare times we forget and pull the door open while running and it does it again. I bought another switch from amazon and thought ok I’ll pull the door open and see if the new switch does it. It did and fused together again. So not I’m back at square one. I have another new switch that I’m going to put in and we will just press off while I find another fix. However I thought if the switch is normally open while running, then will it work without that normally open switch so I put everything back together without that switch and it works. I even pulled the door to find out if the microwave would stay on and it turned off and works like normal. So my question is can I just leave it that way??
Hi @lifecast , What is the model number of the microwave? It is not good practice to disconnect any of the door interlock switches as they are there as a safety measure It appears as though the NC* switch - the one that is open when the door is shut and closed when it is open) is carrying excess current when the door is opened thereby fusing its’ contacts. The other door switch ( NO* switch - the one that is closed when the door is shut but open when the door is open) may not be opening in time preventing the excessive current flowing through the other switch or may be short circuit. Did you check if the interlock mechanism for the door switches is OK and not broken, distorted etc or that the other door switch (NO switch) is operating and releasing OK and not short circuit? (use an Ohmmeter to check its’ operation - do this with the power disconnected from the oven and watch out for the HV capacitor - discharge it properly first) NC = Normally closed NO = Normally open
