Question about Kenmore Microwave Ovens

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Microwave has an error code F9 after running for about 5 seconds

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  • Kenmore Master
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Some quotes from other forums, but note that you need to look up your model to verify part numbers:

"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 proceedures. 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."

There should be a "mini-manual" hidden inside the unit behind the control panel or hidden behind the grille, which is very helpful when troubleshooting, & testing.


To find helpful exploded view diagrams and get part numbers, you can just enter your full model number at the Sears parts site.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########.

BUT once you have the part number from the Sears site, you can often get the parts cheaper
here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on May 30, 2010

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Posted on Jan 02, 2017

MicrowaveSvc
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SOURCE: Kenmore built in microwave - f9 error

F9 is indeed a door switch error.

 

I would suspect that if the switches are good, a couple of wires may be reversed on them, or maybe one of the door switch mounts is broken.

 

There may be a wiring diagram in the oven, either pasted to the cover, or folded and stored behind the control panel.

 

If you can supply the actual model number (not 636xx, etc.) I can try to find a wiring diagram.

Posted on Oct 12, 2007

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1 Answer

Error Code F9.Q (Touch Communication).


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Jul 27, 2015 | KitchenAid KHMS2050SSS Microwave Oven

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Kenmore built in microwave - f9 error


F9 is indeed a door switch error.

 

I would suspect that if the switches are good, a couple of wires may be reversed on them, or maybe one of the door switch mounts is broken.

 

There may be a wiring diagram in the oven, either pasted to the cover, or folded and stored behind the control panel.

 

If you can supply the actual model number (not 636xx, etc.) I can try to find a wiring diagram.

Oct 12, 2007 | Kenmore 63652 Microwave Oven

1 Answer

Microwave runs for 5 seconds then shuts down displaying F9 HELP


If the microwave runs for a few seconds and stops the touchpad might be at fault. This is not common. Generally speaking, if the microwave display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad

Oct 19, 2014 | LG Microwave Ovens

1 Answer

Model number 721 82364200. Code F9 continues to show up. Seems to be connected to clock. Works intermitting. Makes a noise when working but is very inconsistent. Not sure what to do.


Sorry to read about your problem, I hope this helps you out.

The F9 error code indicates an inverter failure. If you continue to receive the F9 error code after unplugging the unit for 5 minutes, the control system assembly may need to be replaced.

Note : Microwaves are not good do-it-yourself projects. Microwaves are inherently dangerous to service. Internal capacitors can retain a lethal electrical charge even when the microwave is unplugged. A microwave radiation leakage test must be performed on the unit following any repair.

I tried to help you. Please help me and Rate/Vote on my response. We take the time to answer your question. take the time to rate us.Thanks and good luck

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Dec 31, 2010 | Kenmore Microwave Ovens

1 Answer

Hit the start button and runs for 6 sec then code F-9 can't find manual


You didn't mention your brand or model, but F9 code on an LG sometimes means either a bad door switch or a loose door switch mount.

See this file on door switches.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

Here is more info on F9 as it relates to some brands and models:

Sears Kenmore Whierlpool 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 proceedures. 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.

Jul 02, 2010 | LG LMVM1945 Microwave Oven

1 Answer

F9 err cd on Mod 721-80869400 be caused by metal tray in micro?


The F9 error code indicates a failed inverter. If resetting the unit does not help you will need to have the inverter & harness checked.


http://media.fotki.com/1_p,wbgdfgsrsttwqwbxgtqsskgwtqkq,vi/kgdfkfrkkxkfdtftrfb/1/1303472/5961857/image45625img-or.jpg

This can sometimes by caused by a power surge or glitch through the electrical lines.
You can sometimes clear this fault by completely unplugging the microwave for 1 minute.
Plug it back in and see if the fault code returns.
If it does, then you have an internal component failure that will need to be serviced by a technician.
Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances.
Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged.
A microwave radiation leakage test must be performed on the unit following any internal component repair.

It does not ALWAYS indicate a inverter control board problem however in other brands/models.
LG's service manual (for an example) suggests the f-9 code could be due to line voltage, magnetron, inverter module, "Relay2", or a loose connection between door/magnetron/control pcb.
Other indications might help narrow down these choices before having to pull out your multimeter and crack open the microwave case.
For example, if the microwave works, but heats slowly, then the troubleshooting manual narrows your choices down to magnetron or line voltage problems, and pretty much rules out the other possibilities.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Aug 24, 2009 | Kenmore 63792 Microwave Oven

1 Answer

F-9 Error after running a few seconds...


If this is a "SmartWave" branded microwave oven then F9 is an error that indicates an inverter board or magnetron has failed. Either way.. Try this...With the F9 error cleared, start the oven and listen for a ticking sound. The inverter will attempt to 'fire' the magnetron 5 times.(ticking sound). If can hear ticking, replace magnetron....Else in may be a door switch problem

May 30, 2008 | Microwave Ovens

2 Answers

Kemore microwave model number 721.63763300


F9 is an error that indicates an inverter board or magnetron
has failed. With the F9 error cleared, start the oven and
listen for a ticking sound. The inverter will attempt to
'fire' the magnetron 5 times.(ticking sound). If can hear
ticking, replace magnetron. Check owners manual. Part may be covered by limited warranty.

Mar 26, 2008 | Kenmore 62622 Microwave Oven

2 Answers

F-9


Need to know the entire model # on the microwave.

Oct 05, 2007 | Microwave Ovens

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