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Our furnace began making a loud band during ignition of the gas. This only happens once in a while.

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An obvious sign of a dangerous situation !!!!
Please don't risk lives for the sake of a few dollars. This condition could cause an explosion if not addressed by a certified technician, a.s.a.p. Shut it down and call someone ! It might only be a cleaning of the burner, so don't risk your lives. You have to agree to the repair and price before they can do it, so if you think it's unreasonable, call in another.

Posted on Mar 31, 2011


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I have a gas furnace with electronic ignition. Sometimes when the furnace comes on there's a loud bang in the ductwork.It doesn't happen everytime. A damper? Is it a danger? Ruin the furnace?

I don't know if cleaning your furnace would be the answer. But I sure know I would be calling my HVAC people to ask what could be wrong.
If your afraid of spending money needlessly, go onto UTube and see if you can find some clues there that you can try.
I'm not thinking that it's any danger to your furnace.Or even if there's any connection of the problem to your TV being on. But possibly, your wiring might be a bit messed up. Who installed it ? If any wires were crossed during installation, or if the wire to your TV or furnace was taken off the power of the other, that might be your problem. Almost like having too many plugs plugged into the same outlet.
I would check that out first before I would go for a cleaning.

If you feel your furnace needs a cleaning....just open it up and take a vacuum to it. That's mostly what they do anyway. Also...make sure your filter is really clean. If needed, install a new one to be secure.
Sometimes, even dust can throw something off. Hope you can figure out what's causing the problem soon.

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1 Answer

I have an old coleman furnace we use at our hunt camp.Last year we were there and the furnace started to ingnite under the burner and make a loud bang. It blew the pilot out it was so loud and hard. What...

Neil, usually when this happens, it's due to delayed ignition. What happens is the gas is released from the burner, but is not ignited in a timely manner. That's why there was a loud bang, when it did ignite and blew the pilot out. Clean the interior of te furnace, particularly the firebox chamber will help. A shop vac with a hose, brush & crevice tool attachments will help in cleaning it. Also, use a can of compressed air with a straw nozzle (like you clean your computer with) to blow out the pilot tip and the surrounding pilot assembly. Vacuum the burner(s) thoroughly, as they may be partially clogged with dust, lint and spider webs.

Competing all of the above, should help solve the problem. Doing it on a regular basis, is good routine maintenance.

Hope this helped and thanks for choosing FixYa.

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This is what we call a "delayed ignition",(gas is not being ignited right away), gas builds up in the chamber and then lights causing a boom. The cause of this problem could be from having dirty burners or ignitor not position to ignite the gas right away or your ignitor may not being glowing enough to ignite the gas being released, check all, Good luck.

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