Could be a fault in the electrical circuit supplying power to your microwave. Check the plug and receptacle for signs of damage (burnt or missing prongs, loose fit in receptacle). This would be a good place to start and something you can do yourself.
Sounds like there may be a malfinction this can happen if the unit has been struck by lighting or if it gets to old, you can purchase the same unit here or purchase a new one>>>www.discountbargainprices.com
SOURCE: Kenmore ultra elite microwave hood combination
F9 code can mean something different depending upon the particular model.....
1.) IF your Microwave uses "UltraWave technology"/"SmartWave technology"...Then either the Magnetron has failed or the Inverter board has failed OR maybe the control board has failed (HUH?).
2.) IF your Microwave does NOT use "UltraWave technology"/"SmartWave technology" then one or more of the door switches has failed.
** "UltraWave technology"/"SmartWave 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.
Note: This 'technology' may come in other flavors as well
SOURCE: F7 Error code on Kenmore
On the tech insert found in a cavity under the cover of my Kenmore MHC, the F7 code means the inverter board ($90 - $130 street price Fall 2008) is bad and needs replacement. I am having this problem, and verified that the magnetron was not shorted to ground with an ohm meter. I verified with a volt meter that the magnetron was not getting any voltage applied across the cathode from the inverter board when the microwave is running ("WARNING"- don't do this test with the magnetron connected.) I have an inverter board on order.
SOURCE: I have an error code
Quoting another board:
Sears Kenmore Whirlpool LG 721.63683300. F-9
on this microwave IS inverter related.
There is a service tech
troubleshooting document stuffed in behind the control board cover
which has some testing procedures. My problem was the magnatron and
checked out bad with the help of this document. It would run for a few
seconds making clicks and then say F-9. It has been working great since
I replaced the magnatron PN 6324w1a002c.
f9 model 721.63764300
Kenmore
Elite 36 " over tne counter microwave is supplied by LG made by Gold
Star, made in China. It's main problem is the high voltage inverter
board supplyed by Sears Parts. If you get a F-9 code on your microwave
display screen and the micro quits it's probably this board. Reset the
machine by pulling the power plug and waiting an hour. If it is the
high voltage board is at fault it will probably fail after 45 seconds
of start up. This part is really hard to get at but is less than $100.
A qualified technician should be able to remove and repair this item in
less than hour. Some techs will quote you $300 labor, don't buy it, it
should cost a $100 or less. No need to buy another microwave.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: Kenmore Microwave Hood Combination oven Model Service code (SE) ?
I have Microwave Kenmore model 401.80082700 about more than a year. After about 6 months, it stated to have some probles such as some number keys not working. Then button START become nor working some times. I can use only button of 30 secon increment to cook something. OK, the fan is working for most of the time but the levels are stuck, not adjustable. I can't changer the fan levels. Now the lamp buton is dead. Sometime, the fan level control is working by itself level 1, 2, 3.... then it appears -SE- on the display. nothing work now. I unplug.... then plug back, it ask to input the time or date... I can't do any thing. Later some time I can cook by using 30 secon button.... It is anoying. Please how I can fix it? Thank you.
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