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howdy asked How to get my forced air gas furnace to burn?
My forced air gas furnace is blowing only cold air when I need heat. I believe the limit switch is bad - it won't reset. Does the limit switch cause the pilot to not light? There is no manual pilot. How can I get the automatic pilot to re-light?
And got the following answer:
Usually when the fan runs constantly and no heating takes place a limit switch has tripped usually due to overheating or flame roll out. Some limit switches have a manual reset button on them that you would push in to reset. Running the furnace with a dirty or plugged filter will increase the air temperature of the furnace and can trip the high limit switch.These typically reset themselves when the temperature comes back down and do not have a reset button.They can be weakened due to constant cycling and not reset. Your furnace may have a control board with a diagnostic light on it that may be blinking a fault code. This would narrow the problem down to whatever the code chart says. This should be on a panel somewhere. Your furnace may not have this feature as there are many different models and brands that use different controls. Without details we would be just guessing. I would suggest getting a tech out there to diagnose it properly.