GE Advantium 120 Convection/Microwave Oven "beeping 45 seconds" Questions

beeping about every 30-45 seconds. What is the F3 error message and how do you clear or fix it? Thank you. On a GE/Hotpoint, F3 means you have a failed keypad. If you or someone you know might want to

...beeping for Advantium 120 After making popcorn, screen sometimes (sometimes not) shows sensor error. It then proceeds to beep every 45 seconds. It does eventually stop, perhaps after glass carousel ...

...45 seconds left. Opened the door, added some buns to be warmed up and hit start again. Cooked for maybe 45 seconds, and instead of the Done beeps I got the -FS- stuff. The oven functions in every way ...