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1guitarman 10-26-2005 01:55 PM

Gas furnace problems
I recently tried to start my LP gas furnace for the season, and couldn't get the pilot light to stay lit. It's an older model (Heil-Quaker model #NUGG100BA01) with a manually fired pilot. After some online investigating into usual suspects, I installed a new thermocouple (so much easier typing that than actually doing it- I actually had to drill the old one out of the brace!) and cleaned the pilot.

Now when I attempt to light the pilot, the flame is about 4" long. This obviously scared the crap out of me, so I let go of the pilot button/switch. It went out right away. I tried it again and held it for about 45 seconds (to hopefully activate the thermocouple) and it still went out. With the pilot going crazy, I'm not very inclined to try it again.

Before I installed the new T/C, the pilot light was at normal height when button/switch was held. There wasn't an unusually large build-up on the pilot before I cleaned it- I don't believe someone adjusted it up to compensate for a blockage (I'm not the original owner).

For starters, I am not sure how to adjust the pilot light lower. Where are the adjusting screw(s) located? Secondly, is there something else I can check to find out why it isn't staying lit?

It's getting colder and have too many other places for my few dollars to go right now! Any help would be greatly appreciated!

rabadger 11-11-2005 09:05 AM

You have to purchase a new LP gas pilot assembly. Sounds like you messed up the orfice.

normlynn 04-14-2006 08:23 AM

I wasn't sure how to do a new posting here so I just replied to yours. I have an old (1989) Duomatic-Olsen 90% efficient updraft furnace in my old house. Someone I called for AC service told me I would need a new furnace because the area above the furnace is getting hot. There is a spot on the outside where there appears to be rust. One furnace guy I spoke with said it is because the paint burned off. (I just discovered I can't use the text tools above) Two of the repairmen are saying it is getting too hot. Could it be because the heat exchanger coils are dirty? What else could it be? Normlynn

glennjanie 04-15-2006 02:43 PM

Please call a registered LP gas repairman! You are in danger of blowing yourself and the whole house up. LP gas doesn't dissipate in the air like natural gas does; it lays in big puddles on the floor and will explode with the slightest spark.

glennjanie 04-15-2006 02:53 PM

Normlynn, you are the victim of scam-artists. It is normal for a furnace to get hot. How else could it heat? No, the heat exchanger is not stopped up; if it were there would not be any heat getting through and your house would fill with smoke. I recommend a carbon monoxide detector (approx. $30) and if it goes off you need a new frunace. Check around and get a professional who is a member of PHCC (Plumbing Heating Cooling Contractors) or the Home Builder's Association.
The local Better Business Bureau would appreciate a report on those other guys.

tellerarms 04-28-2006 06:18 PM

I have an 17 year old model Trane XE60. We had a home inspector come out yesterday and look at the house (furnace included) and since he left our furnace pilot went out (connection/coincidence?), we follow the directions for lighting the pilot, but it won't stay lit. Once we let up on the button it goes out. We're cold! What can we do?

woodworkingmenace 04-29-2006 08:32 PM

Tellerarms, its just a coincidence, (and they always seem to show up when some one inspects something...its murphys law or something like that), but, you will need a new thermocouple and the pilot light will stay lit.

If you have a bad one, then the pilot light will not stay lit, and the thermocouple HAS to be in the flame, when you put the new one in, or it wont work! (You wouldnt believe some of the things I have seen...people not wanting them in there because they want to "save them"...LOL!! Oh well).

It'll run ya about 4 bucks or so, then put it in per instructions and you will have heat..

Just my two cents worth


pqglen 05-04-2006 08:56 AM

I would agree with glenjanie. Get a licenced pro and spend a couple bucks and live. If you dont know what a thermocoupler is you probally shouldnt be replacing it.


woodworkingmenace 05-04-2006 10:10 AM

I have NEVER heard of "drilling" out the thermocoupler in my life!

You may have mess up the "orifice" in your haste to drill, slipped...

Personally, I would have used some WD-40 or PB BLASTER on it, let it sit a few minues, then tapped it out with a small hammer downwards. (few small taps first and if that didnt work, then take a small wire brush and work around the thermocoupler in that manner)...

Make sure you air it out very well, if you use a "flamable" product such as that, to get all the volatile organic contents out...

Of course, this is for "future reference" since you already messed up the orifice...or, if you didnt, there should be a spring loaded screw somewhere to adjust the flame as on a gas furnace there is on the "gas valve".

As was stated, if you dont know what your doing, get a qualified service person there to do it! Its not worth your life or your familys life, or even home or limb!...

Just my two cents for what its worth, and a wee bit extra for the collection plate...


asbestos 05-06-2006 09:18 AM

1949 American Standard boiler
Yep this baby still runs, it is an oil fired water system. An old guy who runs a plumbing shop came out to see it and said it was the oldest he had seen in a few years. It has a newer burner, and a new circulator pump and one original pump. I am thinking it is time for a new one, but this baby refuses to die.
And Oh, yeah The furnace with the burned paint -scary

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