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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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1 Answer

I have a Lenox furnace. Before this igniter kicks off, there is a loud noise comes from furnace. Where is that noise from? Thanks.


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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1 Answer

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check ur venting first make sure its not plugged

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1 Answer

My heater will not light. It is eletric ignition, there is power coming into the unit.


In order for the furnace to light, a few things must happen. The thermostat must have a call for heat thus making a connection (closing a switch) sending a signal to a computer circuit board. The board will in turn blink a light indicating a call for heat is registered. It will then send power to a fan motor that will remove old air from the burner area and introduce fresh air to the burner. Once the blower comes up to speed, the pressure closes a a pressure switch. Once the switch closes, it sends power to an igniter, either a glow type or spark type. It also sends power to one side of the gas valve to open up the pilot gas valve and send gas to the pilot assembly. Once the computer senses there is heat at the pilot valve, it will open up the second gas valve and send gas to the main burner. The trick is to know where it is going wrong. First you must watch this sequence to follow the workings. To do this you may have to remove some panels on the furnace and hold a door switch closed temporarily to trick the furnace to run. Follow the sequence above to find where it ain't happening and look at what must be done to fix it. It could be as simple as a bad thermostat (no call for heat) or a plugged exhaust vent not allowing the pressure switch to close. Let us know how you make out with the diagnosis!

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1 Answer

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Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

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This happens when the furnaces tries to light to many times and doesnt succeed. If you stand in front of the furnace while it is coming on, you will be able to hear the problem. If its an electronic start, there will be a clicking sound, followed by the gas valve opening to start it. If it has a pilot light, make sure it is lit, then listen for the gas to come out, it will make a hissing sound. If no gas is coming out, first double check to see if the gas is turned on to the unit, if it is, then its possibly the gas valve. Oh, if it is electronic, and you hear gas, but dont see a glow inside the furnace, or no glow or gas, it could be the ignite. Hope this helps.

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1 Answer

Coleman forced air furnace blower


Rmove the two screws holding the blower in place and slide it out. With the power off, rotate the wheel and inspect for debris or an impingement. If everything turns easy, you have a bad motor or start capacitor. If you have rubbing, adjust the wheel. If the motor will not turn, replace it.

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