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A common symptom of a failed magnetron is a failure to heat with everything else (magnetron fan, stirrer, timer, etc.) working fine. Check the GE manufacture date for the unit on its nameplate to determine the age of the magnetron. For GE models of the past, magnetrons had a 10 year parts replacement warranty. Magnetrons can be expensive, so you need to weigh all your options, i.e., repair versus replacement, before you commit to one solution.
I am in desparate need of either a GE Jet343G oven with a manufacture date before May of 1989 - or a manual or some documentation that shows this oven was made before than.
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.
Unfortunately, there is no way to tell which part the microwave needs without opening it up for examination. There are a few parts that, if defective, would prevent the oven from heating.
a high voltage transformer which passes energy to the magnetron
a magnetron which converts high-voltage electric energy to microwave radiation
a magnetron control circuit (usually with a microcontroller)
This is NOT a repair that you would want to attempt yourself. The labor for the repair would cost a minimum of $50 and shouldn't exceed $100. You'll also have to pay for the necessary part if it's still available from the manufacture or their parts distributor.
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