Lower oven not heating, upper oven heating only a little. When turning on getting error message F1-1 or F1-2. Now receiving same error message when using the stove top. Not having any issues with heating or cooking on stovetop except the error message after cooking fo awhile anywhere from 1/2 to 1 hour time. I hqve turned off the range at the power box and reset it but that has not made a difference. Any help would be appreciated.