Question about Heating & Cooling
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Posted on Jan 02, 2017
Make sure all the wire connections are good and tight. Next lift off the cover and look for a little thermal disc mounted up by top of the heat exchanger. Most have a re-set button but not all. If you have this ,by-pass it ,see if that solves the problem, if so it may be defective, or doing its job and you have a venting problem. If you don't have this and have changed the thermocouple (was it a copper tube with a fitting that screwed into the gas valve, or did it have 2 wires, that is a pilot generator, kind of same thing) make sure the probe is set correct, with the pilot flame heating the top 1/3rd of the probe. The only thing left is the gas valve.
Posted on Dec 25, 2007
Pilot lighted furnaces have a thermocouple made from disasimilar metals that when heated create electricity to actuate a relay that alows the gas to flow to the furnace.
When the thermocouple gets coated with carbon from the pilot lights constant burning it acts as an insulator and keeps the thermocouple from getting enough heat to generate electricity, a very good safety factor.
What you have to do is locate the thermocouple it should be located over the pilot light, you will see a gray substance around the thermocouple it will be hard like cement, take a knife and scrape away as much of the gray material as possible then sand the themocouple with a medium sandpaper until it shines, use one of you wifes emery boards, this should solve your problem.
Posted on Feb 24, 2009
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
Check the pilot light size. Is it small and not surrounding the top 1/3 of the thermocouple? If it isn't then the pilot orfice is restricted or the pilot tube compression nut could be loose. The pilot gas adjustment screw may also need adjusting if this gas valve has one. These problems should only be addressed by an experienced service tech.
Posted on Nov 10, 2009
Sounds like the flame sensor is dirty or bad. This sits in the burner flame when the burners are running. This usually has a single white wire connected to the back of it.
Posted on Jan 03, 2010
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