Wont heat code f-9 model 721 - Kenmore Microwave Ovens

Chances are that is just a defective top or bottom door switch or its mount.
See our help file on door switches here.
Also, that model number does not show up as a valid US Kenmore model.
Please check the tag in the cooking cavity or elsewhere n the oven and let us know if you need further help.

The F-9 error code indicates a defective control board, inverter or line voltage too high.
Read more: http://wiki.answers.com/Q/What_does_the_code_F-9_mean_on_a_Kenmore_Elite_Microwave_oven#ixzz1FMSrTmbU


Hope that answers your question and it won't be too expensive.
Check on ebay for prices.

I checked the owners manual and it does not list the fault codes. Manufactures leave this information out of the manual most of the time so you have to call them for service.

Call 1-800-4-my-home (sears) and tell them the problem. You will also need to provide the m# so have that ready when you call.

Good Luck

Hello :

The F-9 error code indicates a defective control board, inverter or line voltage too high .

WARNING : A microwave is capable to give you a serious electrical shock even when it's unplugged , so I recommend you to call a repair technician for help .

good luck .

please don't forget to rate !

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.

Hi! from what you have describe, it seem that your magnetron is not working that is why it is not heating. try to look for a busted fuse.

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.

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.

Seems like I answered this, but maybe it's a different poster.

The 721 model code means it's an LG/Goldstar-made oven and F9 indicates a problem with the inverter or magnetron.

Due to the lethal voltages involved, I do not recommend that a person without training and experience ever work on these models.

I would suggest you contact Sears for service.

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

It is child lock and you can unlock it by press and hold the start button.