The F12 error on the Kenmore range means Bad Micro Identification which means the logic chip in the main control is bad. The only thing that can be done to try and reset this error is to kill power the range at the breaker for 1 minute then restore power and if F12 keeps displaying the main control board will have to replaced to repair the range. The replacement board part number, order information and instructions to replace it can be found at the link below.
This Kenmore Range F12 error troubleshooting and repair information applies to model 79094002600 and all the models listed under the related models section below.
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