My Kenmore microwave will do everything but the magnetron will not turn on! I can enter a time and hit start... the light will turn on, time count down, and bell ring, but the fan and magnetron will not start up.
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Is the door closing properly? Do you hear it "click" when it closes. A lot of times the problem is the door switch. It is located inside the microwave. They are made of plastic and they break. If the switch is broken, the magnetron(microwaves) will not start.
If everything works, but no heat sounds like the magnetron circuit has failed. Since it is brand new, just take it back to the store and complaint that it does not work, and ask for a refund or replacement oven.
My Kenmore 721.63259301 would not heat items up so I came here and saw
the parts required and was just about to order them when I checked the
online owners manual and found this. FULL FIVE-YEAR WARRANTY ON
THE MAGNETRON For five years from the date of purchase, if the
magnetron in this Kenmore microwave oven
fails due to a defect in material or workmanship,
Sears will repair it free of charge.
My microwave has a manufacture date of July 2009 so I will be taking it
right to the closest Sears repair center for a free repair. I suggest
everyone do the same.
If everything appears to be working normally, as you say the timer counts down, the light comes on, turntable rotates etc. then the problem will be linked to the magnetron not operating & not heating the food. This could be just a thermal fuse device which may have gone faulty but if it is a magnetron fault then the cost of getting this replaced can be expensive & it might be more economical to buy a new microwave. I would advise taking it to a local repair centre, one which gives free estimates to get a quote on a price.
Probably a high voltage diode popped because contaminated grease eventually built up and made a path for a high voltsge arc to occur.. To confirm,take the outer cover off the microwave and discharge the high voltage capacitor by shorting its terminals.Then pull the plug off the magnetron side and place it near the magnetron socket. Now turn the microwave on and push the connector on the magnetron with a chopstick or a long insulated screwdriver. If no arc when you do this this confirms a bad diode.
Sounds like the magnetron has failed. It is the magnetron that generates the microwaves that heat the food. If it or the circuit that powers it fails then it stops heating. There are some high voltage circuits that feed the magnetron and you can potentially get hurt if you don't know what you are doing. Would recommend you have it serviced by a professional if you want it fixed, otherwise look for a new one since the cost of repair can come close to the price of a new microwave oven.
This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.
Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.
Switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.
If you someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
You can probably find an exploded view by entering your FULL model number here: http://www.searspartsdirect.com
A full Sears/Kenmore model number usually has 3 digits, a dot, then 8 more digits, such as ###.########
If you think the problem is on the control panel, which we repair these nationwide for $39.95 postpaid.
We're happy to help and we appreciate your thoughtful rating of our answer.
Generally, the most common causes of a failure to heat are:
- bad door switches or door switch mounts - loose connection at the magnetron - problem or loose connection on the control unit circuit board - bad magnetron or other high voltage part
If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk