Question about Kenmore 62702 Microwave Oven

1 Answer

Microwave making noise, not heating

All of the sudden my microwave started making a rattling noise, but it continued to run, meaning the lights, timer, turntable etc worked, however, the heating element doesn't appear to be working. It's a "built in" unit and I can't get to the back or sides of it. Also no error code appears. Everything looks normal. the power level is at 100% so I know that's not it.

Any suggestions would be helpful.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Kenmore Master
  • 8,795 Answers
Re: Microwave making noise, not heating

Was the noise something like someone growling into a coffee cup?

As odd as that sounds, that's a common sound for a bad magnetron to make, a hollow gurgling or sizzling.

It may be the magnetron, but 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:

You can usually find helpful exploded view diagrams and order parts by entering your FULL model number here: (the 3 is correct)

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

Posted on Dec 04, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Microwave makes noise when on

All microwaves make some noise when running. Cooling fans, exhaust fans, turntable motor, transformer, and magnetron all make noise. I assume you mean some unusual noise. I need to know more about what kind of noise it is - a loud roar, a rattling sound, a high-pitch squealing sound, a "clunk-clunk" sound or what? By the way, a "klunk-klunk" sound is frequently caused by small debris stuck to the wheels of the turntable support tray. Try cleaning those wheels and the track they roll in.

Oct 21, 2014 | Whirlpool Accuwave Microwave Oven

1 Answer

My LG over the range microwave makes a rattling noise when I am cooking. The sound is not there is the item I am microwaving is heavy.

This may sound a bit nuts, but remove the glass tray and support ring. Clean the wheels and ring. Also clean the glass and microwave surface where the wheels run. Any tiny bit of debris will stop the wheels from turning, and make a rattling noise.
If that doesn't help, you may need a new turntable motor.

Feb 26, 2011 | LG Over-the-Range Microwave

1 Answer

Rattling, crackling type noise just started and is constant when microwave is running.

A couple of months ago my microwave started making crackling, rattling and grinding sounds everytime i used it and i thought it was going to break down. It turned out one of my children must have spillled or overflowed something with a clear liquid because the micro did not look dirty but there was a crunchy substance under the wheels of the turntable. Once i cleaned this up totally the noises all went away.

Jan 19, 2011 | KitchenAid KHMS155LSS 1000 Watts Microwave...

1 Answer

When started,light& turntable operate normally,but no heating by microwave. Transformer normally sounds smooth,but now makes rattle or vibrating noise,like something is loose.

Check the door safety intertlock micro switch for proper behavior. If it is faulty, the oven will think the door is open and will not turn on the magnatron.

Sep 22, 2010 | Panasonic NN-C980 Convection/Microwave...

1 Answer


the lock on the door could be loose so the microwave light will turn on but it wont heat u should press on the door or buy a new one emai me at

Jul 21, 2009 | Microwave Ovens

1 Answer

Microwave run with a different noise and stopped heating up food

Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips


Mar 18, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave will not heat

Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.
Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
 Q - The microwave display counts down and the inside light is on,  but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
Q - The fan in my microwave oven is not running will this hurt my microwave?
A - YES, the fan cools the magnetron and electronics, take the microwave in for service, most fans are not too expensive to replace.
Q - My microwave blows the fuse inside itself as soon as I push the start button.
A - Usually a shorted high voltage capacitor...see components section.

Mar 06, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Constant rattling noise during operation

possibly the "stirrer" motor - this is in the top and turns a metal reflecting ring to disperse the microwaves around the oven more evenly. About $70 on GE site for my oven.

Jun 08, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Lights up BUT does not cook

was there any motor that should run as you turn it on, the fan inside and the rotating table motor. try to replace that micro switch at the door that bubbled out and burnt. try to test or replaced right away the industrial diode that is connected from the capacitor to the ground of the microwave.

Feb 17, 2008 | Panasonic NN-S763BF Microwave Oven

Not finding what you are looking for?
Kenmore 62702 Microwave Oven Logo

1,002 people viewed this question

Ask a Question

Usually answered in minutes!

Top Kenmore Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

8793 Answers


Level 3 Expert

6993 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Kenmore Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides