Hello, this is Ava with Think Crucial.
It seems that there may be something blocking the airway. To fix this, please make sure to unplugged the unit from the power before performing this.
There are two places where you can check for a blockage: the dust cup air duct and the intake opening behind the brush roll. To check for a blockage in the dust cup air duct stand the vacuum upright and remove the dust cup. Now you can disconnect the super stretch hose and check for clogs in the air duct behind the dust cup. If that is not the case, to check for a clog near the roller brush lay the vacuum down. Next check the opening behind the brush roll for clogs. If there is debris, clean the opening with scissors, carefully cutting away any debris.
If the dust cup is too full, there is no space for the dirt to go when you are vacuuming. To fix this, remove the dust cup and empty the it. If your vacuum is still not picking up dirt after emptying the dust cup, keep reading for other options to fix the suction.
If both your foam filter and felt filter have not been cleaned in the past month, this may be why your vacuum has lost suction. To clean the foam and felt filters, remove the dust cup and pull out the two filters that are on the top of the motor base. Rinse the filters with lukewarm water until the water is running clear. Let the filters dry fully before putting them back into the vacuum. If your vacuum is still not picking up dirt, you may need to replace it.
If none of the other solutions worked, your motor may be bad. You would need to check with Shark about this.
If your need to replace your Shark parts such as filter, belts or hose, you can also order replacement parts directly to us. You can check our online store in this link: http://www.thinkcrucial.com/search?type=product&q=shark
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Think Crucial Customer Care