Question about Kenmore Microwave Ovens
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.
Posted on Oct 05, 2008
The 665 the model number prefix means it's made by Whirlpool. F7 means it has a problem with the control board or keypad.
The first thing to try is a "hard reset". Unplug it from the power line for a minute, plug it back in, set the clock, then try again.
If it still has a problem, we repair these for customers nationwide with our guaranteed $39.95 service. If a new keypad were needed, that would add about $60 to the repair cost.
Please feel free to contact me directly if you need more help.
We're happy to help and we appreciate your thoughtful rating of our answer.
William E. Miller, AS-EET
Posted on Jul 04, 2008
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Posted on Jan 02, 2017
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.
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Posted on Nov 23, 2008
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