I have a Heil model H9MPD075F12C1 which requires a power cycle once in a while to start operation. On some occasions the burners will ignite and go out approximatley 15 seconds later. A couple cycles of this and the system will usually run normal for a while. A day or two later and we'll notice the system not running at all and have to cycle the power again. I noticed a post on cleaning the flame sensor and will try that for the burner issue.