When I turn it on the combustion motor comes on, then the ignitor, then the gas and it lights up, then the blower motor (everything so far works as it suppose to), then 2 to 3 minutes later the gas shuts off and it starts the cycle again (i.e. the ignitor, then the gas,..). I switched the fan to "on" instead of "auto" but no difference. If you can help troubleshoot this problem, I'd really appreciate it. Mac Matar (mmatar@aol.com)