Question about Kenmore 63662 / 63664 / 63669 Microwave Oven

1 Answer

F9 error code

My microwave is showing an error code of F9. Everything on it works with the exception of the heating function. I have tried to unplug it for 10 minutes and it is still not working. Any ideas? Thank you!

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  • Anonymous May 13, 2008

    Experiencing the same error code - F9 - and same results; food is not getting hot.

  • Anonymous May 17, 2008

    F-9 Error Code. Microwave not heating

  • Anonymous Mar 15, 2014

    F9 error message

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  • Kenmore Master
  • 9,098 Answers

F9 is caused by either a bad door switch, a loose door switch mount.

Even though a door switch clicks, it may still be bad inside.

This can be caused by slamming the door or by habitually opening the door while it's cooking without hitting the Stop pad first.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Posted on Nov 28, 2007

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LG's service manual troubleshooting section suggests the F9 code could be due to line voltage, magnetron, inverter module, "Relay 2", or a loose connection between door/magnetron/control PCB (Power Control Board).

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 possiblities.

In other cases, F9 error code indicates an inverter failure. 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.

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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

I HAVE CODE F9 WHAT NEED TO FIXED COME ON BUT GO OFF AFTER 5 SEC. AND CODE F9 COME ON


A bad inverter is usually the cause of this code...try to unplug the unit and then plug it back in... if that don't work then you will need to have it checked...


The F9 code 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.

Basic Microwave Oven Troubleshooting Tips

heatman101



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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.

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Let us know if the hard reset doesn't fix it.

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