Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)
How do i relight the pilot light on a 7900 series coleman mobile home furnace
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Posted on Jan 02, 2017
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
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.
Posted on Mar 11, 2009
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