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Old 10-28-2013, 07:22 AM   #1
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Loud Sound from ELECTRIC HEATING

We have a class A motorhome. When we use the electric heat, there is a rotating humming sound that gets louder then softer. Also, when it shuts down there is a slight bang. Not sure if this is common with the electric heat systems?
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Old 10-28-2013, 07:37 AM   #2
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Well it would help to know what kind of rig (RV) were talking about and the age (model year) of the rig. Now what i can tell you is these sounds you are hearing could be the systems fans and/or pumps working a little harder than the norm. You might want to check the coldair inlet filter and make sure there's no blockage. I hope this is of some help to start with.
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Old 10-28-2013, 09:28 AM   #3
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Quote:
Originally Posted by dianewhite View Post
We have a class A motorhome. When we use the electric heat, there is a rotating humming sound that gets louder then softer. Also, when it shuts down there is a slight bang. Not sure if this is common with the electric heat systems?
If I recall correctly a friend had the same or similar problem. It turned out to be a bent fan blade. It threw the fan off balance. Once replaced the noise was gone.
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Old 10-28-2013, 09:34 AM   #4
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IF you have the Dometic heat pump in combination with the a/c units, the sounds you are describing are normal.
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Old 10-28-2013, 01:41 PM   #5
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If you have the Coleman Polar Mach air conditioner/heat pump combo that sound is normal as it cycles in heat pump mode.
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Old 10-30-2013, 07:44 AM   #6
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First question is, "is the electric heat part of the rooftop a/c, and if so, is it a heat pump or an electric heat element?". Or if it is not part of the a/c system, what is it?
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