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Old 11-27-2011, 12:44 PM   #16
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Heil Furance NUGK075DG03


Doc, no luck after cleaning it, still the same. The unit will make clicking sound to try to light (and you can see the blue flame), soon the blower runs and it will go on like this and not shut itself off. I first noticed this while I "thought" the furnace was running normal, did errands, came back two hours later and still clicking away to light and house cold.

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Old 11-27-2011, 12:59 PM   #17
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Heil Furance NUGK075DG03


Sitting from here I'm going to guess you have a gas valve problem. Not once did I ever see the full flame throughout the entire chamber light up, only that one pilot looking flame in the middle and it wasn't even big.

Usually the entire set of flames will burn ON in full force and then shut off.

It's either that or the control board.

At his point I'd clean all gas orifices (pull the burners out and knock the dust of it so to say) and check for good ground wire to the furnace. Even replace that flame igniter/sensor with a brand new one (if you have not done so already as many times cleaning a sensor is not enough) and see if that helps.
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Old 11-27-2011, 01:21 PM   #18
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Heil Furance NUGK075DG03


Doc, here are some photos I just took.

https://picasaweb.google.com/1030331...eat=directlink
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Old 11-27-2011, 01:32 PM   #19
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Heil Furance NUGK075DG03


There are ways to test if a gas valve is the problem such as with a manometer to test gas pressure. You may need to call a tech out.

At this point, either by yourself or by way of an hvac company, you're either going to toss a few parts at this until you fix it or buy yourself a new furnace. I say that because it's been said that this particular Heil is a pain in the rear to begin with.

Those pictures don't do me any good sitting here, they don't tell me anything I don't already know or don't already don't know rather.

If I were in front of your unit with my complete tool bag I could tell you something but in forum form your best bet now may be to call a tech out.
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Old 11-27-2011, 01:43 PM   #20
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Heil Furance NUGK075DG03


I take that back, your pictures do tell me that your black steel gas supply line to the unit does not have a drip leg on it. A drip leg is a small upside down Tee in the gas line used to catch debris in the gas line so said debris doesn't clog the gas valve thus allowing proper gas flow to all orifices, allowing ALL burners to light.


Again, I'm assuming it's the gas valve clogged up/bad. It wouldn't be the first time.
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Old 11-27-2011, 01:46 PM   #21
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Heil Furance NUGK075DG03


Usually the drip leg is located just at the entrance (on the outside) to the furnace versus in the furnace. Do you have one?
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Old 11-27-2011, 01:50 PM   #22
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This is a drip leg. Granted its on a gas water heater but same difference, to prevent debris from clogging the gas valve. Nowdays that drip leg is mandatory on all new gas furnace installs. 10-15 years ago it was not.

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Old 11-27-2011, 01:52 PM   #23
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Heil Furance NUGK075DG03


Debris is heavier than natural gas, by far, so gravity alone will make it fall into the T. That's all you need.
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Old 11-27-2011, 01:53 PM   #24
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Heil Furance NUGK075DG03


Say, where'd you go? I was just getting warmed up..
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Old 11-27-2011, 02:05 PM   #25
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Heil Furance NUGK075DG03


Yes, there is a drip leg. I did think about that as I stared at it and wondered if it's clogged. Last year when I had this problem (it seems to come and go), the tech cleaned the unit (not a very good job I thought), but of course when he was there it ran perfectly, the next day it did not.

My next plan is to take a look at the main orifices. When I turn it on, I don't smell gas at all.....should I?
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Old 11-27-2011, 02:07 PM   #26
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Heil Furance NUGK075DG03


I was going to mention, for whatever reason it ran fine up until in recent days. It does have a mind of its own.
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Old 11-27-2011, 02:12 PM   #27
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Heil Furance NUGK075DG03


Quote:
Originally Posted by Stuart007 View Post
Yes, there is a drip leg. I did think about that as I stared at it and wondered if it's clogged. Last year when I had this problem (it seems to come and go), the tech cleaned the unit (not a very good job I thought), but of course when he was there it ran perfectly, the next day it did not.

My next plan is to take a look at the main orifices. When I turn it on, I don't smell gas at all.....should I?
Party pooper. But even with a drip leg small particals of debris can pass it up and make it to the valve and over the course of 10+ years build up.

Yes, the main orifices can become clogged as well, that's what I was referring to cleaning when I previously said, "Knock the dust off it."
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Old 11-27-2011, 02:17 PM   #28
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Heil Furance NUGK075DG03


Any suggestions for the best way to clean them? I was going for all the easy solutions first.

I'll give it a shot and get back to you. Thanks!
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Old 11-27-2011, 06:36 PM   #29
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Heil Furance NUGK075DG03


Well Doc, same thing. I took out the burner cleaned all the dust/rust and cleaned the orifices, and made sure the alum pipe that leads to the pilot was clean as well. Still does exactly the same thing on the video I posted.

If my foot was big enough I would squish it.
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Old 11-28-2011, 09:53 AM   #30
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Heil Furance NUGK075DG03


Hey doc go thru checking out the pressure switch and tubeing with him I'm posting on my phone and its way to lenghty...ken

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