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Thumping noise while running

\015 While heating the room, the fan starts good, but, after a few minutes of running, it starts making a loud noise like it is coming loose with a lot of thumping sounds. We turn the unit off as soon as we hear the noise. I am just assuming that there may be loose bolts holding certain part of the unit. Can you help\015

Answers :

Sounds like the bearings are bad or something is catch in the fan

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