SOURCE: f9 code on mod 721-80869400 kenmore elite
This is usually inverter trouble, but it may be the magnetron, controller, wiring, etc.
There
should be a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating components.
To find helpful exploded view diagrams and get part numbers, you can just enter your full
model number at the Sears
parts site.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
SOURCE: Kenmore microwave oven model # 721 63684300 built
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
SOURCE: What does the code F9
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.
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