F9 indicates a fault with the door lock (for self-cleaning mode). Could be the lock itself, the control board, or wiring in between.
If you can use an ohmmeter, this link has some pretty good instructions for troubleshooting a GE oven with F9 error. It does require cutting power at the breaker box and some specialized tools, plus the repairs are somewhat complicated.
How to Fix F9 on GE Oven Hunker
SOURCE: monogram wall oven F9 error
“F— AND A NUMBER • You have a function error code. Press the CLEAR/OFF pad. Allow the
OR LETTER” FLASH oven to cool for one hour. Put the oven back into operation.
IN THE LOWER OVEN • If the function code repeats, disconnect all power to the oven for at
DISPLAY least 30 seconds and then reconnect power. If the function error
code repeats, call for service
Here is someone that had the exact same problem: intermittent F7 error code. I couldn't even get it to do the F7 error . There's a pretty good tech service sheet inside the control panel. I followed its procedure for testing the keypad (which was nothing more than pressing all the buttons and hearing it go "BEEP!" 
).
But the tech sheet did mention that intermittent F7 problems are usually caused by poor connections. So I pulled the ribbon connector off the control board and cleaned the copper connectors using a pink pencil eraser. That whupped that puppy!
But then I went out on another service call, same oven, different house. The pink pencil eraser trick didn't work on this one so I had to apply some of that famous Samurai gray matter. To identify the problem on this one, I cut power to the range and disconnected the ribbon connector that connected the touch pad to the electronic range control (ERC) board. Then I re-applied power and let it sit that way for 24 hours after which the customer was instructed to call me and report on the error code status of the oven. If no error code was reported, I knew the touch pad was the problem. If, on the other hand, the F7 error code came back, then I knew the (ERC) was the culprit. In this case, the error code did not come back during the test period and, using my keen, Vulcan-like powers of deduction, concluded that the touch pad was defective. I replaced the touch pad and problem solved!
It's important that you don't skimp the disconnect test because there's a big difference in price between the ERC and touch pad. So, you want to be right on this one. Ok, after you do this test and determine which part you need to replace, come and get it here.
**** this helps. :]
SOURCE: F9 code on stove
There should be some number after the F 9 Error code. And, it would look like this F9-1 Latch lock upper F9-2 Latch unlock upper F9-3 Latch lock lower F9-5 Latch unlock lower F9-6 Latch both lower This is just to give you an idea. But one thing you can try is UNPLUG THE UNIT AND LEAVE IT LIKE THAT FOR AN HOUR OR TWO, AND THEN PLUG IT BACK ON.
SOURCE: MICROWAVE WILL NOT HEAT. F9 APPEARS IN THE DISPLAY WINDOW
F9 indicates a problem with the door latch. There is a safety switch that will not allow the microwave to operate if it detects the door is not closed properly. Even though physically it may seem the door is shut, the safety switch is not relaying the message to the onboard computer. You need another door latch switch.
SOURCE: Jenn-Air free standing range: displays
Hello there
This a common problem with these
F9
Door lock
safety circuit on power relay board sensed
Replace power
relay boardok I would contsact the nearest appliance parts repair center to see if this can be replaced and how much it would cost and mayby you can do it yourself it would save you a lot of money ok?
hope this is very helpful for you
Best regards Michael
Hi
F9 is a door lock error and to solve this issue you can hold
the light switch for 15 seconds, this will reset the control. If it won't work
then hold the light switch in and set the unit to clean and after a minute
press cancel to cancel the clean cycle. If still it won't work then the door
lock assembly should be replaced. Hope this helps...please post
back for further assistance.
Daniel
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