Furnace Noise

[estegmann]

On a recent trip, we used our HP and Furnace and noticed a thumping sound periodically. Both systems seemed to warm our 2012 19' Flying Cloud just fine however the noise was very noticeable. Does anyone know what may cause this and whether it might be a simple adjustment or something more...I contacted airstream and they said it could be the HP working hard due to the low temps and recommended we switch over to the Furnace. I did as recommended and the noise persisted. Any help would be appreciated.


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[Rich W]

Originally Posted by estegmann

On a recent trip, we used our HP and Furnace and noticed a thumping sound periodically. Both systems seemed to warm our 2012 19' Flying Cloud just fine however the noise was very noticeable. Does anyone know what may cause this and whether it might be a simple adjustment or something more...I contacted airstream and they said it could be the HP working hard due to the low temps and recommended we switch over to the Furnace. I did as recommended and the noise persisted. Any help would be appreciated.
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Sounds like the noise happens with either HP or furnace. Does it happen after either has been running a while? If so, I'm guessing a piece of aluminum is flexing as it warms up. Can you locate the sound? Since heat rises, I'll bet it's a ceiling panel.

[Lumatic]

Originally Posted by richw46

Sounds like the noise happens with either HP or furnace. Does it happen after either has been running a while? If so, I'm guessing a piece of aluminum is flexing as it warms up. Can you locate the sound? Since heat rises, I'll bet it's a ceiling panel.

Doesn't need to be aluminum. Can be any metal including the furnace and ductwork.

[Gsmblue]

Any chance you could record it and post it? Maybe a video and put it on YouTube? Our heat pump is noisy when it kicks in and our furnace is hardly a mouse, not a thump though..

[estegmann]

Yes! It does start only after the unit has been running awhile. I've tried to isolate the sound and initially thought it was coming from the duct. Will need to spend more time now that we're home from our trip. Does this sound like something that may simply need adjustment or that which we'll just need to live with?


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[Wayne&Sam]

A heat pump will thump when the compressor cycles, just like it does in air conditioning mode. But the sound wouldn't come from the furnace duct. They are separate systems so it's hard for me to figure where the thump would come from on both. Unless it is just something in the camper warming up. Maybe oil canning of the belly pan?

[Rich W]

It could be something in the AS too, doesn't have to be part of the trailer. In my garage is a metal can of Coleman fuel, nearly empty. When I open the garage door, depending on the weather, I'll get a nice clunk when the air hits that can and expands or contracts it.