Question about Jenn-Air JMV8208A Microwave Oven
The microwave lost power. The nothing works, like it is unplugged. I tested the bus fuses, fine. Thermal Fuses behind control panel, one has continuity the other does not, but the new thermal fuse also did not have continuity.
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Posted on Jan 02, 2017
I have a different Jenn-Air built in microwave & oven combination but I'm sure my solution will work for you as well.
My microwave was plugged into an outlet located on the top of the oven. This outlet has a "circuit breaker" that tripped while we were using the self cleaning feature on the oven. You just need to reset the breaker button right next to the wall oven outlet. Why it tripped is a mystery since the microwave was not in use at the time. Bad design.
Of course, getting to the reset button is your only challenge. You need to pull the microwave and oven out of the wall/cabinetry in order to get to it. The unit is heavy so you will need help. Or, call a certified repairman and they should be able to do this for you in 30 minutes or less so the service call should not run you more than @$85 if it is no longer under warranty.
I would also suggest you contact Jenn-Air to complain about this issue and seek reimbursement from them if necessary.
Posted on Jan 04, 2008
SOURCE: Jenn-Air Microwave - no power
Had the same problem. Removed the unit (snapping off the upper and lower trim rings was a chore but they do snap off) and tested the power. Plug behind the unit was good. Pulled the cover and checked the thermal fuse with ohm meter. No good. Replaced fuse, microwave would run for a second, then light goes dim and it buzzes, then it blew the fuse. Per above suspected Capacitor. Changed that, and we are back up and running. Thanks!!
Posted on Sep 27, 2008
The information on the fuse is the maximum rating. The holder may not match the rating.
The 'A' is the very important part of the size. You will need a 15 Amp fuse. The best fuse to use is 'ceramic'. You can find them at Radio Shack in the back of the store there are drawers with electrical parts.
15 Amp ceramic
Posted on Jun 10, 2010
For future reference, I always recommend that you turn on the microwave's hood vent exhaust fan whenever you're cooking on the stovetop or oven.
Depending on the brand and model, there will be either a thermal cutout or thermostat on or near the magnetron. There is also one on top of the oven chassis ceiling, but under the outer cover.
Either device may have opened.
In many brands there is a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.
At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.
Accessing some components (especially the oven cavity thermostat / thermal cutout) for testing and possible replacement will require you to remove the oven from the wall.
If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.
You can download GE owner's manuals and installation instructions here.
You can download owner's manuals and installation instructions for several brands (including Amana, Frigidaire, Jenn-Air, Kitchenaid, Litton, Maytag, Roper, Tappan, Thermador and Whirlpool) here.
You can find links to helpful exploded view diagrams and part ordering help here.
I recommend that you bookmark that link to your favorites.We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer
Posted on Jun 26, 2010
Testimonial: "Tnx. 20A brkr. on therm. oven tripped."
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most likely you will have to remove the louvers or trim above the cooking cavity to get to the fuse, look for screws holding the trim/louvers on, if no screws are apparent, the piece may slide to the left or right and pop off.
Unplug your microwave. Although it might seem like no electrical current could possibly be running through your appliance, it could still have stored electrical current somewhere in the system. Be safe rather than sorry and unplug it before you begin.
Find the wiring diagram for your model of GE microwave. You can contact GE directly to get this if you cannot locate your owner's manual. Note the fuse locations and get a screwdriver. Some GE fuses are located under the louvers, while others are located in the door.
Open up the microwave and locate the blown fuse. Sometimes you cannot determine a blown fuse by visual inspection so check it with a multimeter for continuity across the terminals.
Replace the blown fuse. Go to your local hardware store and pick up a matching fuse. Make sure you check the model numbers of the fuse as well to be sure you get the right component. Install the new fuse and put everything back together.
Check the continuity of the circuit if you continue to have power problems. If you have a problem with continuity in the circuit, then you may have a bigger problem than just a blown fuse. Sometimes a power surge will fry a GE microwave's circuit board, which you will need to replace.
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