Kenmore Electric Oven Model 4088816 - Error Code...

Question

Hi,

We have never had any problems with our oven (EVER!) :-) (yes it is an oldy but goody - purchased in 1991)

Tonite after using it earlier in the evening with no problem we turned it on to preheat and after about 30 seconds to a 1 minute, the Display window went to F3 and the oven started to beep.

Can you tell me what this means. I can't find any information in the Owners Manual about error codes

Thank you so much!