Question about Bissell 3750 Lift Off Bagless Upright Vacuum

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Our cleaner has recently started making a sound like an air raid siren. We have cleaned all filters no difference the noise is terrible.

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Check the drive belts for wear and tightness and make sure that the front brush(es) are clean and free of all hair and fabric. This will normall cure the problem

Posted on Nov 14, 2009

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Check the complete air way. Probably something stuck in the passage. Start from the bottom plate. Usually jammed where the airway does a turn.

Posted on Nov 15, 2009

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I posted the part second because it takes 24 hours to complete it.
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High pitch


Sounds like you have a clog. Make sure the filters are clean, replace if it has been more then a year, check the inlet down by the brush roll, your clog maybe there.

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