The furnace quit on Friday night around 2pm (it was 15 degrees F outside!). My wife and I both noticed it was getting cold in the house. The burners would light (it has a glow plug that lights the burners), but then go right back off again within a couple seconds. It would do this again after about 10 seconds. It tried that 3 times, then gave up for a while. I tried turning the power off and back on to reset it, but that didn't help. So, I took the panels off and hit the regulator with my fist (not real hard, but firm tap). It's been working a perfect ever since! So, what worked for the Fonz on a Juke box, also worked on my furnace.