had the same thing on mine but there were two issues, the first was it would be hard as heck to get going then once it was going it wouldn't relight reliably. that turned out to be bugs and such in the combustion area and exhaust piping that I blew out with compressed air. The second issue I had is when I replaced the blower motor it worked on the bench but when I installed it, it wouldn't light at all. turned out the board packed it in right at that time and it did exactly what you're describing. I went with a replacement from dinosaur boards