Whirlpool WP4375321 Line Fuse OEM Part

Tested the High Voltage Capacitor which showing no capacitance and no resistance. Replaced it together with the diode and the line fuse no longer blew and the microwave is back in service.

I read up on others with this problem of microwave-wall oven combination Whirlpool Gold. We live in a very rural area and were not able to get ANYONE to service it - had 2 companies come out to inspect but they never returned. I have wonderful news! We replaced the fuse, bus fuse, and light bulb (quit working 2 years ago) and all is working. Thanks for the information and for the part diagram. Couldn't have done it without you.

Appliance is Kitchen Aid combination oven and microwave built in. Got door open fault on microwave, meaning door switch is worn out. In attempt to troubleshoot, I snapped closed the right side door latch. This blew the 20A line fuse. Purchased both. Watch video on replacing the microwave light bulb show how to slide out microwave. There is only one door switch and it is on the right side. Accessible using two long needle nose pliers. Pull off three terminals, remove old switch, install new switch and install wires onto terminals in correct location. Fuse is above microwave behind the control panel. Consider getting the fuse holder if oven is older (mine circa 2004/5) My fuse holder had heat damage but was able to clean it up enough to get good contact with the new fuse. Old door switch tested good, but was intermittent. Both parts put microwave back in service. Also you'll need to slide out the whole ovens assembly from its built in location enough to get the control panel tilted to be removed. Some screws are small square drive, most are Phillips.