Hello Melissa, thanks for your post!

Based off the information you have provided the door ajar light and alarm continues to go off in your Frigidaire freezer. It appears this could be an issue with your door sensor or the control panel. You may want to perform a reset on your freezer and you can do that by disconnecting the power cord from it for at least ten minutes. If that does not help resolve your issue I would suggest seeking help from a professional technician for proper part replacement. I hope this information is helpful to you. –OOS