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Anyone having problems with a lennox Gas pack unit?

I had my heater guy replace the ingiter module because the heater would not stay on. It kicks on and ignites and then kicks off. over and over again. Any idea what the problem is?
Steve W., December 2004
check the combustion air blower pressure switch

bil, October 2008
i had the same problem... it turned out the belt for the blower had fallen off...hope this can help you out

Dan, October 2005