I have a Payne 399AV that is about 15yr old. Just started to blow non-stop with no heat. Pressed the reset on the auxiliary limit switch, no change. Looking for flame rollout switch shown in Manual can't find. Had a friend look he couldn't find it either. Am I missing it? Filter hadn't been replaced often enough so it wasn't receiving enough air flow. If there isn't a rollout switch is there something I should look at?