Jenn Air JMV8208WB0 Humming when door is closed

Hi @pathosmusic ,

It seems as though it may be a loose or faulty switch but the only way to really know is to test them, with an Ohmmeter.

Be safety aware when working in microwave ovens. The HV capacitor can store >5000V DC for months even if the power has been disconnected for this length of time. This amount of voltage can seriously injure you. The HV capacitor needs to be correctly discharged as soon as it can be accessed after removing the cover from the oven and before any further work is done in the oven. If you don’t know what you’re doing, then don’t do it! Contact a reputable, professional appliance repair service and ask for a quote.

I assume that you verified that there are only 2 switches as according to the Jenn Air JMV8208WB0 parts list (see p.3 & p.4 part # 8, 9 & 19), and these suppliers, there are 3 switches in the oven. supplier 1, supplier 2 , supplier 3 (click on Choose part type > switch)

As an aside, if you’re in the habit of opening the door whilst the oven is still operating to pause/stop it for whatever reason, if this method is used often, there is a chance that the door switch contacts will eventually weld shut (see image) due to the current arcing across the contacts when they’re opening. The arcing causes switch contact migration, because the power was still being applied through them when it shouldn’t be. If it is necessary to pause/stop the oven before the cooking time has elapsed, it is better to use the Control panel controls to do so and then open the door.