Hello Gabriel, thank you for your question and I can understand your concern. Unfortunately, without the model number, I will only be able to provide some general information. The F90 error code indicates that the maximum oven door unlock time was exceeded. This can be caused by a failed door lock assembly, a wiring failure or a failed electronic oven control board. Try pressing in and holding the light switch and then pressing the STOP/CANCEL button while continuing to hold the light switch. This may cause the door lock mechanism to retract. You will need to continue to hold the door light switch in during the entire process of the door unlocking if this process works. If the door won't unlock, try holding the door switch in and programming a new clean cycle and then canceling it. This may reset the lock mechanism. If you are not able to reset the door lock then it may need to be replaced. In this case, I would recommend having a technician make this repair. You can call 1-800-469-4663 to schedule a tech to come out. I hope this will help you.