American Standard furnace combustion hum.


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Old 05-01-18, 04:53 PM
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American Standard furnace combustion hum.

Hi All, 2 year old furnace makes a humming sound noticeable on the first floor, itís not the blower as it doesnít do it when the fan is set to On, seems like it is when the burners are firing.
Thoughts
Geo
 
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Old 05-01-18, 04:59 PM
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Likely the low voltage transformer.
 
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Old 05-01-18, 05:12 PM
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Definitely not the transformer.
Geo
 
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Old 05-01-18, 05:20 PM
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It's not a transformer and it's not a hum. It's a resonant frequency. More like a rumble or vibration. It starts when the burner lights. It could get slightly louder and fade away in a few seconds or hang around for 20 seconds or so.

I have the same issue with my furnace. It could do it once it a while or several times in a row. No rhyme or reason to it. I spoke to a natural gas tech about it several years ago and he told me it's something in the gas composition. Different additives.
 
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Old 05-04-18, 08:40 AM
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Hi Pete, the strange thing is standing right next to the furnace there is no rumbling sounds quiet.
Geo
 
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Old 05-04-18, 09:24 AM
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I know.... my furnace has done the same thing for many years. It didn't when new. It started after I cleaned the burners the first time and has been doing it for at least 15 years. Sometimes it's quiet for weeks. I forget about it and then one time I'll hear/feel like a rumble. It hasn't affected the operation of the furnace so I've since become used to it occurring.
 
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Old 05-03-19, 08:32 AM
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Combustion Hum

Hi All, American Standard Silverline Series has a hum while the burner is firing, its not the blower motor because the as it continues to run after the burner stops firing.
Any thoughts?
Geo
 
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Old 05-03-19, 09:02 AM
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I combined your threads.

Did the problem change or is there a mistype ?
 
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Old 05-03-19, 09:55 AM
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Pete, same problem, I searched for these replies but couldnít find them so I reposted.
Geo
 
 

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