Thanks localnet.  It is blue around the whole burner, but then once I raised it as high as I did it did got yellow.  The one that turned yellow was over the pan that gets hot enough, so I didn’t think that was a problem.   I will try to adjust it like you said.  All American wants $55.00 for one burner, but I looked into the ones that someone posted on here that were $8 and they won’t have them in for another 30 days.  I was going to replace them all because one looks like it could be replaced, but still works, so I figured replace them all if I was going to replace one.  Do you think once it is blue again that it will reach the other pans better?