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Never mind. I figured it out. It was already set on .45. Still baffled. I checked all the limit switches, The trouble light doesn't flash.

What is a heat anticipator in the thermostat?

The furnace comes on and the furnace ignites. It then burns for a few seconds and goes off without the fan coming on. I have changed the flame sensor. Didn't help. Also the fan will come on by itself...