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Burner will not lite.

It will light and burn with the top cover off but will not burn with the cover on. What is causing this?

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  • kiddboy66 Jan 11, 2009

    The air flow is good. I even changed all of the filters as well.

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Sounds like a problem with air getting to the burner. Make sure the fan is clean and there are no obstructions to the air flow.
Hope this helps.
Matt

Posted on Jan 10, 2009

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When you light the pilot, then put on the burner, it will only burn for 20 - 30 seconds and the pilot light, burner and everything goes off. When you re-lite, the Pilot light will not stay on after you...


Either the thermocouple connection into the gas control valve is loose or the thermocouple needs replacing. Also check the burner and pilot assembly inside the screen area for dust, dirt and insect build up. A clogged pilot can mimic a faulty thermocouple.

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usually the small opening on the burner that 'points' to the pilot light will get clogged with cleaning soap or spills. Look carefully (the burner may be very easy to remove for inspection. There should be a small hole on the side pointing toward the location of the pilot light. It will be lower down than the main burner openings. Clean it out with a wooden toothpick.

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I have a coleman furnace with a pilot light that keeps going out.When i manually light it the furnace runs 12 to 14 hours, then no more pilot light and i must relight.


Remove the burner and gas valve from the furnace and use compressed air to blow the area under the pilot area ans all around it. The dust and stuff usually cause a condition called "Lazy Pilot" and the flame is probably not going in the designed directions. While you have it out Id replace the thermocouple with a new one reassemble and re-lite and note the difference. The flame should be mostly Blue and no yellow (or vary little at the top end of the flame only) Orange in the top area indicates a good burning flame and the closer to the base the bluer it gets.


While you have the burner out look inside and inspect the inner heat exchanger for cracks or rusted open holes there should be none. Turn on your fan while inspecting and see if you feel the steady blow of air from it inside the heat exchanger indicating a hole. Don't confuse the air that may come down the flue with the air from the blower though. A little breeze is expected from this.

This will take care of over 90% of the problems with the "Blow out" symptom.

If you still have problems you can try and "turn up the pilot". Usually a screw close to the pilot tubing is covering the adjustment screw. Put some soap bubbles around it so you can see if it leaks or not and turn the screw out for more flame (CCW) and in (CW) for less.

Hope this helps Please grade me accordingly and good luck.

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Have a colemen presidential II- when it is windy at all the pilot light blows out- have checked the vents and have no wind threw them. you can see the wind just howling threw the heater area where the...


Remove the burner and gas valve from the furnace and use compressed air to blow the area under the pilot area ans all around it. The dust and stuff usually cause a condition called "Lazy Pilot" and the flame is probably not going in the designed directions. While you have it out Id replace the thermocouple with a new one reassemble and re-lite and note the difference. The flame should be mostly Blue and no yellow (or vary little at the top end of the flame only) Orange in the top area indicates a good burning flame and the closer to the base the bluer it gets.


While you have the burner out look inside and inspect the inner heat exchanger for cracks or rusted open holes there should be none. Turn on your fan while inspecting and see if you feel the steady blow of air from it inside the heat exchanger indicating a hole. Don't confuse the air that may come down the flue with the air from the blower though. A little breeze is expected from this.

This will take care of over 90% of the problems with the "Blow out" symptom.

If you still have problems you can try and "turn up the pilot". Usually a screw close to the pilot tubing is covering the adjustment screw. Put some soap bubbles around it so you can see if it leaks or not and turn the screw out for more flame (CCW) and in (CW) for less.

Hope this helps Please grade me accordingly and good luck.

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I was told all lights flashing means the pot is flooded. Unplug your heater. Take take the cover off. Unscrew the igniter and pull it out. Roll up a piece of paper towel, put it in there and see if it absorbs any fuel.

You could also be in need of a cleaning. If your burner pot is full of carbon, a chain of it will attach itself to the flame sensor rod, thus putting out the fire. Also if your burner ring in the burner pot is too warped this will put the flame out.

;)

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