My kenmore elite microwave model 721.66462500, serial #706ta01261 has power but does not heat. What could be wrong?

An intermittent or failing magnetron could cause the problem. Although extremely rare, an intermittent high voltage rectifier can also cause this.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0

hi , now that's either power supply to power the magnetron or the magnetron itself ...

Regards
Rob

Owner Manual
Manual Kenmore Elite Microwave hood combo 72186013010

No power at all would point to a breaker or fuse for the power. You would have to open the back to have a look and test for voltage.

Most likely it would be a bad magnetron since the light, turntable, and vent fan are running.

try" searsapplianceparts.com"

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My Kenmore Elite Microwave Model No. 721.64683300 does not seem to be heating well and will shut off and flash an F9 code. What does the F9 code mean

This is most likely a failing magnetron.

If it's less than 5 years old, Sears/Kenmore should cover the part, but you would still have to pay for a service call.

If you or someone you know decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.