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Furnace lights but flame goes out almost immediatley

\015 The burner comes on, you can see a flame but just as fast as it comes on it goes out. I've changed the thermostat and that didn't help...\015

Answers :

It's the limit switch that is located on the fire box. There are two wires that go to a disk about the size of a penny and in between the two wires is a very small button. This button resets the limit. If this switch is tripped, the flame will immediately go out to protect you from carbon monoxide poisoning and possible fire. If it will not reset, then take the two wires off and use another piece of wire to jump the switch. If it lights, then you know that the limit is bad. If not, then there are a few more to find. There could be 2 to 3 of these on the fire box and there is usually one near the inducer or on the inducer.

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Furnace lights but flame goes out almost immediatley

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Gas furnace lights then goes right back out

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