Question about Kenmore 62622 Microwave Oven

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F9 error My Kenmore began displaying this yesterday. Assuming it is the magnetron, is this something I could replace or am I better off buying a new microwave? I know the microwave is on a shared circuit, might this have caused the failure? it is only two years old. Thanks!

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  • microken Jun 11, 2008

    Thanks for the reply.

    There is a slightly louder hum, otherwise it seems to operate "normally" for about 5 seconds then simply stops and displays "F9" .

    Also, the shared circuit it utilizes has never caused it to blow a fuse.

    model # is 721.64684300

    Thanks!

  • kdmw Jul 03, 2008

    F9 error on kenmore elite ultra wave microwave. model # 721.80863400

    Sears repair says it will cost $400 to fix. he said it is the invertor that is bad.I hear the ticking noise you described. I dont trust him because I had to show him your web site before he even knew what an f9 code was!

    Please tell me where I can get the part and how to fix myself. I just know I will pay them for the invertor and then have to fix the magnatron anyway!

  • jkmm Dec 15, 2008

    I have the same error F9 today. Where you able to find the PART# and how to replace it?

  • Richard
    Richard May 11, 2010

    On some models, F9 may indicate a failed door switch. Is it making a louder than normal humming or grunting sound when operating?





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Your Microwave uses "UltraWave technology"
I'll explain a few things about this wonderful technology...
The control board (accepts the pushbutton commands) has to talk to the inverter board to tell it how much power should be applied to the magnetron. The inverter board will then power the magnetron and inform the control board if the magnetron is working OK.
If there is something wrong with the magnetron or inverter board or a there is a communication breakdown between the control board and the inverter board...WA-LA-----F9----

A pretty reliable test for the Magnetron is to operate the oven and listen for a ticking sound 5-6 times about a second apart. If you can hear the ticking....The magnetron has failed..if no ticking, the control or inverter board failed.

The Magnetron sells for about $78.00 and is simple to replace. Check your owners manual for limited warranty on the MAG and electronic parts.

Posted on Jun 12, 2008

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