The furnace stars (inducer runs) ignitor lights up and then the flame sensor turns on the blowers for about a minute or so. The furnace turns off, blows cold air and then it locks out (1 blink). The furnace does not give me any other blinks but the 1.

How long does the gas flames stay on?

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Originally Posted by hvac1000

How long does the gas flames stay on?

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It stays on for about 30 seconds at times and then a few minutes but not longer than 5 minutes

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Originally Posted by tidesny

It stays on for about 30 seconds at times and then a few minutes but not longer than 5 minutes

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It is possible the flame sensor is dirty. Try cleaning it.

I`ve cleaned it several times and it still has the same problem.

Are the orifices screwed in on your furnace? If so remove the offending burners orifice and make sure it is clean. Remember to use pipe dope on the threads when you screw it back in.

Quote:

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Originally Posted by hvac1000

Are the orifices screwed in on your furnace? If so remove the offending burners orifice and make sure it is clean. remember to use pipe dope on the threads when you screw it back in.

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All the burners light up with a blue flame. Yesterday I turned it on and it stood lit for about 10 minutes.

So it is working?

Keep us posted if it fails again.

No sad to say.. I just ordered the limit switch...

It turned out to be the circuit board, have heat now finally. Lol

Thanks for the update.