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My portable AC/heater is making a LOT of noise, intermittently and loudly. Then it returns to normal volume, only to return to loud noise level later on. What might be the cause? Mobilair MA-9000AH - six years old (manufactured 2004-05-5).

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It can be the fan which is at times going unbalanced and vibrating the body of the unit. It will be when the fan is touchin the sides of a metal part that the noise seems to come up.
Since the noise can be traced to the source of origin, it will be good to carefully open the set out and test.
If the blade are causing the issue, clean and set, if not the bearings/bush must be defective,

Posted on Sep 03, 2010

  • notmickey Sep 03, 2010

    thanks for the quick response. I'll check that out.

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