Hi, my stove top burners all work fine. The oven on the other hand no longer functions. Started a few months ago by not lightng immediately the small flames would be there but it would take a good fifteen mins. before it would actually take off and the oven would get hot enough for cooking. As time went on it would take longer and longer for it to get going. Then one day it stopped working all together no small flames anything. Like I said the top stove burners work fine. Is it possible that I had a thermal coupler go out on the lower side. Also there is no gas smell when the oven is turned on and the igniter element does not get hot but it isn't cracked that I can see. Any help would be great.