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Old 11-18-2020, 05:59 PM   #1
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Brand: Thor Motor Coach
Model: Challenger 37FH
State: California
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THOR #19539
Furnace: Noise

Hello again everyone,

I noticed a very loud humming noise from my furnace. Anyone else have the same problem? If so, have you figured out what was the problem?

Thanks again.
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Old 11-18-2020, 06:46 PM   #2
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Electrical hum
Mechanical hum
Air velocity hum
Rattle interference hum

Only when flame on, only on high, always there at the same frequency/volume?

I have a part (few people have seen) to recommend, but we don't know what's wrong....
It could be anything from a loose vent to a ceramic dish plate to the outside door finding a sound frequency it loves.
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Old 11-18-2020, 06:53 PM   #3
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And is it a different sound than when it is running normally? I assume you know what it sounds like normally?
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Old 11-19-2020, 12:58 AM   #4
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Furnace noise

First couple of times using the Furnace the howl was a bit much. There was several different sounds and thinking something was amiss from the factory (how strange.... not!) I removed the door and took a look. I found that the flue section in the door that has a vent for supply and exhaust looked like it was too far into the flue tube. You can see on the one pic that on the lower side the straight tube from the door overlapped the bottom of the curve in the bend, creating a bit of a 'lip' which may be creating some sonic howl or turbulence.

Reading the installation instructions the overlap between the two tubes only needs to be 1-1/2" and this was closer to 4". So I cut off an inch of the tube in the shop (dremel to keep from oblonging it), polished the end and reinstall. Last pic you can clearly see bottom of the flue curve looking in the exhaust end.

Results are better but not perfect. A bit less in intensity and howl inside. But still louder than I would like. Outside about the same. Next project is to get some sound deadening foam and install inside around the furnace watching the clearances for air flow.

Fun Fun Fun...
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Old 11-19-2020, 01:11 AM   #5
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https://www.amazon.com/dp/B01CTM0H1S...v_ov_lig_dp_it
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Below is a link to most of my modifications either accomplished or pending.
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Click on my pictures then click the pop-up for a full screen zoomable picture.
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Old 11-21-2020, 03:28 PM   #6
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Quote:
Originally Posted by ducksface View Post
Electrical hum
Mechanical hum
Air velocity hum
Rattle interference hum

Only when flame on, only on high, always there at the same frequency/volume?

I have a part (few people have seen) to recommend, but we don't know what's wrong....
It could be anything from a loose vent to a ceramic dish plate to the outside door finding a sound frequency it loves.


I think air velocity hum.
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Old 11-21-2020, 03:29 PM   #7
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Quote:
Originally Posted by 16ACE27 View Post
And is it a different sound than when it is running normally? I assume you know what it sounds like normally?


Fist time Iíve used it. But definitely not normal.
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Old 11-21-2020, 03:33 PM   #8
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Quote:
Originally Posted by pneumatics View Post
First couple of times using the Furnace the howl was a bit much. There was several different sounds and thinking something was amiss from the factory (how strange.... not!) I removed the door and took a look. I found that the flue section in the door that has a vent for supply and exhaust looked like it was too far into the flue tube. You can see on the one pic that on the lower side the straight tube from the door overlapped the bottom of the curve in the bend, creating a bit of a 'lip' which may be creating some sonic howl or turbulence.



Reading the installation instructions the overlap between the two tubes only needs to be 1-1/2" and this was closer to 4". So I cut off an inch of the tube in the shop (dremel to keep from oblonging it), polished the end and reinstall. Last pic you can clearly see bottom of the flue curve looking in the exhaust end.



Results are better but not perfect. A bit less in intensity and howl inside. But still louder than I would like. Outside about the same. Next project is to get some sound deadening foam and install inside around the furnace watching the clearances for air flow.



Fun Fun Fun...


I thought that was the problem with mine as well, because it looks very similar to your picture.

Thank you so much. I will consider doing the same.
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Old 11-21-2020, 03:36 PM   #9
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Originally Posted by ducksface View Post


Wow! I didnít know these existed. Thank you so much.
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Old 11-21-2020, 04:10 PM   #10
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Ir's humming because it forgot the words...
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Old 11-21-2020, 05:44 PM   #11
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Originally Posted by Bob Denman View Post
Ir's humming because it forgot the words...


LOL!!!!!!
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Old 11-21-2020, 07:15 PM   #12
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Since I'm not too bright: I might as well make people smile...
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Old 11-22-2020, 01:52 AM   #13
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Originally Posted by Bob Denman View Post
Since I'm not too bright: I might as well make people smile...


Making people smile takes a lot of talent. Thank you.
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Old 11-22-2020, 02:34 AM   #14
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Don't forget to tip your waiter, and I work Blue after 10:00 pm.
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Old 11-22-2020, 03:17 AM   #15
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Quote:
Originally Posted by Sdkim View Post
Hello again everyone,

I noticed a very loud humming noise from my furnace. Anyone else have the same problem? If so, have you figured out what was the problem?

Thanks again.
Quote:
Originally Posted by 16ACE27 View Post
And is it a different sound than when it is running normally? I assume you know what it sounds like normally?
Quote:
Originally Posted by Sdkim View Post
Fist time Iíve used it. But definitely not normal.
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Old 11-25-2020, 08:31 PM   #16
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I insulated this "Cold air intake" area with home HVAC duct insulation some contact spray. It help with the fan noise but not the deep drone of the burner. Still much better than factory.
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