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Two things to check here. Doubtful the control board is good despite checking out good. Broken solder joints on OEM boards give false readings. If this has had a board upgrade by Dinosaur Electronics, then it may be good. Otherwise, I would replace it. And the LP pressure at the tank regulator may be too low. This needs to be checked and adjusted at least once a year. Many people don't even know this. Most shops sell the Dinosaur Boards, but online they are usually cheaper. Try that and then get back to me if you are still having issues. It might be a bad burner, but that is much less the case. Hope that helps! R.J.