Error F9
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Is internal component in the 
c. board , you must replace it complete.
God bless you
Posted on Jul 21, 2013
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Posted on Jan 02, 2017
SOURCE: Kenmore Microwave model 721 62624200
We see this a lot. The problem is almost certainly on the control panel, which we regularly repair nationwide for $39.95 postpaid.
This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.
Details of our service and critical safety information and disassembly information is at our site, linked here on Fixya:
http://tinyurl.com/yzjozk
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Nov 26, 2007
SOURCE: microwave no heat
The "HUMM" indicates a breakdown in the High Voltage Side. The loud "POP" was the breakdown. You have only four Components in the High Voltage side.
1. High Voltage Transformer. You can eliminate this as the problem. Why? If it was the problem it would have blown the line fuse, and would have given off a burned transformer smell.
2. High Voltage Diode. Usually will Burn or Pop when shorted, but will then OPEN the Circuit and there is no "HUMM".
3. High Voltage Capacitor.This is the Silver Can with the two terminals on top. It can SHORT internaly between the plates (the two terminals) and give the "HUMM".
4. Magnetron. This is my number one suspect. A SHORTED Magnetron.
Posted on Feb 03, 2008
SOURCE: Humming sound, F9 and dead
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.
Posted on Jul 19, 2008
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.
Posted on Nov 23, 2008
SOURCE: kenmore microwave model 721-63252301 - no heat
we are going to try to find a fuse and replace that or just buy a new microwave
thank you
Posted on Jun 06, 2009
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