Error code E68 keeps coming on?
Here are your parts
http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5159014
Here isn the tech sheet for this unit.
http://manuals.frigidaire.com/prodinfo_pdf/Webster/134509400efs.pdf
E68 looks like a stuck key error.
Try unplugging the unit for 5 minutes or so, to see if perhaps it will reset.
Try to free the key.
If that does not work you will have to replace the control board.