Rumbling sound coming from furnace


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Old 10-13-12, 10:49 AM
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Rumbling sound coming from furnace

Hi everyone.I'm not good with furnaces so excuse my basic descriptions of things. My furnace is making a rumbling sound, sounds like there is a baby Harley in my basement haha. All my flames ate lit when its running. The wheel that's connected to the fan that goes to the hot pipe leading out the house spins freely. Have a new filter. I think noise MAY be coming from the little device that appears to be in the middle of the gas line coming into the unit with the other end feeding my burners inside. Any ideas what to try to get roof of the noise?
 
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Old 10-13-12, 11:01 AM
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That part you are describing is the gas valve and should make no noise. A make and model number of your furnace would be a big help too. That blower on the top is the draft induction blower. It comes on first before the flame lights. Is that when the noise starts? Or does the noise start instantly when flame lights or does the noise start a minute or two later when the blower motor starts ?
 
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Old 10-13-12, 04:32 PM
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I'll try it out again later and look for the model. I know as its turning off when the flames are out but it is still blowing for minuteor two, the noise is gone.
 
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Old 10-13-12, 09:05 PM
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When the thermostat no longer calls for heat.....the inducer blower on top will stop and the flame goes out. The main blower inside the bottom of the furnace will continue for several minutes until the unit cools down and there is no longer any heat left to extract. If it's the second choice then you can turn off the emergency switch or turn off the breaker and open bottom cover of furnace. That's where you'll find the blower. Maybe it's an older belt driven blower or a bad direct drive blower motor. Try spinning it by hand.
 
 

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