Hello midge, thank you for your inquiry!

From my understanding your Frigidaire range is displaying an error code of “F-!”. That appears to be an invalid error code. I would recommend performing a reset on your range and you can do that by flipping the household circuit breaker off for at least ten minutes. This will help clear out any false error codes. If you continue to receive an error code of “F-!” you may need to replace the control panel or wiring harness due to a shorted component. I would recommend having a professional technician out to perform a proper diagnosis and repair. This will help you avoid any unnecessary part purchases. –OOS