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Well, I tried the furnace this morning, the pilot light ignited and then out of the blue the burner or coil or whatever caught, there was the familiar rumbling sound and it worked.. started blowing...

Mike
Thanks so much for taking the time to respond.
Well the pilot is igniting, I see the blue flame. But I bet you are right about the sensor or the burner.
Of course it's a weekend.. when else...

Hi. I have a gas furnace, not sure of the brand. It is blowing cold air. When I watched it go 'on' before, here's how it generally works - the pilot light ignites, then generally several seconds...