Frigidaire conventional oven won't heat up

The motor for the rotator is bad. It has to be replaced.

Usually when both elements are not working and everything else is working fine, the problem is your OCU (oven control unit), commonly known to consumers as the clock.
The clock controls the oven and most times does not produce an error code when it fails.
You will need the actual model number from a sticker located on the oven frame when you open the bottom drawer, the sticker will have the model and serial number clearly listed.
Do a Google search for that model number and find the clock.
I've provided a link for what probably is the proper clock but without the full model number I can't say for sure:
http://www.appliancepartspros.com/frigidaire-clock-316207529-ap3764682.html

Contact a professional to have the unit diagnosed for repairs. Sounds like the heating elements are either faulty or the main control board won't allow the unit to heat up correctly.

Good Afternoon Friend,

I see that your Frigidaire double oven, model# PLEB30T8CCB, is having trouble with the top oven not heating.

I suggest giving your double oven a hard reset by cutting the power at the circuit breaker for at least 2-3 minutes.

After restoring power you will need to reset the clock. You will do this by entering in the time and pressing start.

Turn the oven on to heat up, and if it does not, I suggest either contacting the manufacturer or contacting your local authorized technician to diagnose your appliance. Hope this helps.

-Best Regards-
WP

I would replace the EDC

in version 1 of your model, F7 requires the replacement of the EDC (electronic door control)
in later versions F7 requires the replacement of the EOC (electronic oven control)

I have a Frigidaire Model Number GLGF377ASF. The stovetop burners work just fine but the oven and broiler do not work.

My range will not hold the heat for either the convection or regular heat. the model number is CGLEF385AS2

first check your voltage, and the pigtail connections at the stove, then check your elements inside the oven something has shorted