Frigidaire FEFB78DCD range wont heat but display and lights work

The switch controlling the burner is just a voltage controlling unit (rheostat). It needs to be replaced

If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

I would try replacing switch for that burner. But it also could be a defective burner.

You could have a problem with the user interface board, which is #97A in the attaced breakdown, part #316239500. Hope this helps.

if you have a ceramic cooktop now the elements will cycle on and off at whatever heat level you have them set at. it does take some getting used to especially after a gas appliance where you expect instant heat. a lot of people don't like them, i have had one now for several years and i did get used to it. so hang in there.

It is the burner control (behind the knob). The triac in the control has failed. $50 item, 10 minute change. Just make note which wire goes to which terminal.

I doubt that it is the control board, as the board has little to do with the stove top, but rather controls the display and the oven temperature/feedback monitoring.

Hope this helps.

take knob off and check the middle is not split and hence not turning the shaft

You'll need to replace the burner switch. This happens when the contacts become fused together.

Check the power plug is their any separate plug on it / if none check the control panel some switch to power on .