How do I reset it and use the oven again?
The Kenmore Range F90 error means the control has detected enough time has passed to safely unlock the oven door but has failed to do so. To repair this error you will need to do some troubleshooting to find out if the problem is caused by the wiring, the door lock motor assembly or the main control.
This Kenmore Range F90 error troubleshooting and repair information applies to model 79094002600 and all the models listed under the related models section below.
Repairs for this Error
How To Troubleshoot And Fix Kenmore Range F90 F91 F92 F93 F94 Error
How do I reset it and use the oven again?
The only thing you can do is try and reset the electronics by killing power to it at the breaker/fuse panel on your home for one full minute then restore power. If after that the problem persists there is component failure of some sort. Follow the troubleshooting at the link provided below if you want to determine the cause of the failure.
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