Ash Coming Through Air Duct, Oil Furnace - HVAC - DIY Chatroom Home Improvement Forum

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Old 10-08-2008, 07:50 AM   #1
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ash coming through air duct, oil furnace


We have oil hot-air heat. There was an issue of an oil smell, so I called our service company. They came out, said they needed to adjust an injector or ignitor and the problem seemed gone for a few days but then came back. Different guy came out, said the injector or ignitor (sorry, this was a while ago, forgot which) was bad and replaced it. Problem solved. No more smell. That was last winter. Furnace was off for the summer though we have A/C so air was blowing through the ducts all summer. Now, cold nights have us turning on the furnace. When it first comes on, some black ash comes out of the 2 ducts that are closest to the furnace (not all of them). It looks like black flakes but when you touch them they disintegrate basically - looks and smells like ash to me. It's maybe 5-10 flakes around the 2 ducts, and seems to stop as the furnace runs. (i.e. if I vacuum them up, no more appear).

Any idea what this is, and a guesstimate of the cost to fix/replace? Minor or major problem here..?



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Old 10-08-2008, 08:05 AM   #2
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sounds like it still needs adjusting, too much oil, not enough air? but what do i know? i'm just a mouse....



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Old 10-08-2008, 11:09 AM   #3
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From here in the web it looks like combusted material which could be normal after having the furnace adjusted. It is just burning off carbon build up created when it was not tuned up.

The scary part is what is this combusted material doing in the vent????

Maybe the combustion chamber is bad. But that wouldn't put this into the duct.

Bottom line is something seems terribly wrong here.

I suggest that you ask your local furnace guy to come take a look at it and ask why there would be combusted material in the duct work.
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