If it's really quick then maybe it's the flame sensor.
why the blower is running all the time and never shut off?
How do I fix a furnace when there's banging when turned on and when it's shut off?
Why does the pilot light go out when my furnace kicks off?
My furnace will light and run, but when it shuts off the pilot light always goes out, how can I fix this?
My gas furnace comes on at 4° below the set temperature on the thermostat. Is this a thermostat issue?
Had a technician come out last night change some things and now the heat exchanger is glowing?
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