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Old 10-27-2006, 08:15 AM   #16
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Heil Furnace Burner Problem


Well after reading here I took a couple hrs last Sunday and took a look at my furnace. I looked into all ideas that were posted and found that the sensor that is located beside the ignitor on the pilot tube was carboned up. All I did was clean it up with a peice of emery cloth.
Since then everything has been working A1.
Thanks for the help.
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Old 12-13-2006, 08:45 PM   #17
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Heil Furnace Burner Problem


Thanks for the tips everyone. This should help a lot.

My furnace (Heil DC 90) was also installed brand new in our house in 1999 as part of new construction. I started having issues last winter (of course) just as the temps were hitting the single digits. The furnace would start but wouldn't fire up..then the fan would start and blow cold air into the house. This had happened a few times but, since it was so cold.... To be on the safe side, I called the folks who installed my furnace, and they sent a guy over to take a look at it.

The guy took it apart, looked inside the combustion chamber, and told me I needed a new heat exchanger. He said it would still be under warranty and all I would have to pay was the labor to put it in. He gave me an estimate of $650 for two hours of work. I told him to stick it and got somebody else in to do the same work for 1/2 the price.

Anyway, the heat exchanger was put in and it didn't help at all. As a matter of fact, it started the same thing the very next day. I was so mad at the the whole ordeal (of trying to find a trustworthy repair shop), I said the heck with it, and decided I would put up with it.

Armed with the information you folks have posted here, maybe I will get it fixed right this time. Thanks.
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Old 12-13-2006, 10:10 PM   #18
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Heil Furnace Burner Problem


Check the igniter. It should glow orange when the furnace comes on. If not the igniter is broken and needs to be replaced. If it does glow, try cleaning the flame sensor.
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Old 12-14-2006, 09:15 PM   #19
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Heil Furnace Burner Problem


rakes...yes, it does glow orange, and there is flame when the furnace first comes on, but then it won't ignite. Just from what people have been posting here, and from you said, I think it has to be the flame sensor. I think that will be my project this weekend...get that cleaned up.

Any tips or tricks for the non-furnace savvy/furnace repair novice attempting this fix?

Also...has anybody heard of any sort of recall or technical service bulletin on this issue? Sounds like a common issue with this year/brand/type of furnace.

Thanks again for everybody's help and advice on this issue.

Last edited by Flash-O-Matic; 12-14-2006 at 09:18 PM.
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Old 12-14-2006, 10:02 PM   #20
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Heil Furnace Burner Problem


This is a common issue on all furnaces, because after a long time of use, the combusting gas causes an oxide bulid up on the flame sensor. This blocks the current from passing through the sensor, and the furnace does not know if the gas is burning or not. If its not burning, gas will build up, and could explode, so the furnace shuts off the gas to prevent this. A dirty sensor will cause the furnace to shut down even if the burners light.

It is an easy fix, turn off the power to the furnace, remove the sensor rod, and clean it with sandpaper or steel wool, replace the rod, turn on power and test.
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Old 01-13-2007, 04:20 PM   #21
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Heil Furnace Burner Problem


I have a problem with my Heil DC90 that is approximately 7 years old. It makes a loud banging noise when the furnace shuts off where you can visible see the back panel of the furnace expand and contract. My service repair person put a brace along the back of the furnace but the problem still exists. The noise is so loud that it wakes me from a sound sleep. The service people at the HVAC company that installed this system are baffeled. Any suggestions?
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Old 01-14-2007, 07:55 AM   #22
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Heil Furnace Burner Problem


Can you see the duct work expand or due you see the furnace casing move? The usual problem is that the duct work is not crossbroke or the piece is so long it "pops".

A second problem could be that the duct work is to small.
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Old 01-20-2007, 09:09 AM   #23
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Heil Furnace Burner Problem


OK...was finally able to get to cleaning the flame sensor on my furnance. Well, actually, I called a friend of mine and he came over and showed me what to do...so he actually cleaned it, but now I know what to do.

Anyway, I am STILL having the same issue. I doesn't happen all the time, but it still happens. There are a couple scenarios:

1). The furnace fires up, the pilot comes on, but gas does not get turned on. Shortly thereafter, the fan kicks on and blows cold air through the house.

2). The furnance fires up, the pilot comes on, gas comes on, flame ignites and, as soon as the fan kicks on, the flame goes out.

3). Everything works fine, the furnace is blowing warm air, then, for no particular reason, the flame goes out.

Anybody have any idea what the heck is going on? Any advice would be greatly appreciated. I'm getting this close to calling up a local furnace company and have them take this piece of outta here and have a brand new one installed.

Also, anybody know how a person can get ahold of the company that makes the Heil furnace? I would like to call them and/or send them a nice email...and let them know exactly what I think of their furnances and what the chances are of me buying another one (Has something to do with a snowball sitting in a really warm spot).
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Old 01-22-2007, 12:14 PM   #24
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Heil Furnace Burner Problem


I am having a similar problem--can anyone help? The fan comes on for about 1.5 minutes (the air blowing in the house is cold during this time). Then the fan turns off. Next, another (humming?) sound comes from the furnace for ~15 seconds (gas coming on?). A few seconds later, a bright yellow glow is seen in the furnace for a few seconds (HSI lighting), I hear a “click”, then the glow fades away. The humming sound (gas) stops, and nothing more happens. Then I flip the switch to turn power off then on, and the process starts again.

The last time I tried the process, the gas lighted successfully, so the problem is intermittent. Would this indicate a problem with the flame sensor, gas flow, or something else?

If anyone can help, I'll post the solution when the problem is resolved.

Thanks!

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Old 12-03-2007, 03:20 PM   #25
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Heil Furnace Burner Problem


I just had the same problem. Last Friday I called for service, my furnace was acting the same way as you are describing. As soon as the technician came in and saw it was a HEIL, he automatically said it would be a cracked Heat Exchanger. He used a snake camera and confirmed that it had a cracked heat exchanger. But that wasnlt the problem, it turned out to be the "SMART VALVE" or gas valve.
However, that's not all.. The technician forced me to change the heat exchanger, as it was the law, once he knew there was a crack, he had to change it.There was a danger of getting Carbon monoxide into the house.The good news is that HEIL replaced the Heat Exchanger for free, but the labor was $900.00(3 hours of labor).
So $1,600.00 later, my furnace is running fine, but I'm still looking into this recall issue. If it's that dangerous, then all the houses in my street must get their furnace heat exchanger replaced($900.00) what a scam....

So in your case, look into replacing the Smart Valve...

Good luck!!!!
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Old 12-10-2007, 11:42 PM   #26
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Heil Furnace Burner Problem


I have a 9 year old heil furnace and about once every 2 days the blower won't turn off. It just blows cold air dispite the t-stat calling for heat. When the power is shut off it resets itself and cycles normally for a day or 2. I changed the flame sensor/glowplug and it is still doing the same thing. Any ideas?
The old style furnaces were more dependable, they would give you 20 years and when they did give up they were easy to fix. Reading these posts make me think there may be a lucrative career oportunity in furnace repairs.
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Old 12-11-2007, 05:37 PM   #27
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Heil Furnace Burner Problem


You are right, it is incredible how much they charge for HVAC repairs. Your problem does sound like it can be the Heat exchanger unit. Again, it appears that Heil had a recall on these unts and are replacing them free of charge(you pay the labor $900.00), unless you can do it yourself!! I believe there is a law that only certified HVAc technicians are allowed to repair furnaces...Not sure on that.

My advice is to get a professional in to perform a diagnostic test($50-$80 charge) to see what the probem is...

Good Luck
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Old 01-04-2008, 10:51 PM   #28
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Heil Furnace Burner Problem


I just did a search on Heil furnace ignition problems and stumbled across this thread. I previously had issues last winter with this 1.25 year old Heil furnace (model# unknown), which was cold air blowing for seemingly no good reason. When I installed a digital thermostat the problem has seemed to go away for the most part. Now this afternoon I cannot seem to get any life out of the ?#$% thing other than the inducer motor starting up, by the sounds of it. I'm guessing it's an ignitor issue as I see no glowing even after waiting for several minutes, but I'm not sure where it's located to verify and am also very surprised if the ignitor's toast given the newness of the system. Before I pay for an overpriced service on-site call, could I be missing anything obvious here??
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Old 01-05-2008, 02:27 PM   #29
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Heil Furnace Burner Problem


It could well be the igniter. The igniter is inside an enclosure with a small glass window. You should be able to see the flame, which should be a rich blue. Any orange in the flame is signs of trouble. Being that new, I would think the heat exchanger probably is an upgrade. The symptoms you mention seems to point to the igniter, see if there is vaccuum inthe system. You can disconnect the small vaccuum line and place your finger over it. You should get pretty good suction. The problem I had was that the igntier was actually operating as far as turning on the furnace, these was however, no feedback from the igniter to tell the control to heat.

Good Luck
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Old 01-23-2008, 03:32 PM   #30
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Heil Furnace Burner Problem


I'm having a problem with furnace the thermostat is new and it come on one in a while. When you turn on the heater it would click and then the 2nd click the you hear the furnace come on. Now it the first click doesn't sound the same it doesn't come on with the intensity it used to have and all it does is run without it igniting anything. Any ideas would be welcomed at this polint.
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