Quote:
Originally Posted by Campingwithourgemini
I can live with a constant noise of a furnace, but this is a surging sound and is very hard to sleep through.
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It was "rumbling" before, now you say surging....
That could be caused by changes in the battery voltage to the fan motor. Do you have a voltmeter installed on its supply, usually the house batteries, that you can monitor at those times? Or can you see the current being drawn by the unit?
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