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Does the filter need cleaning? I would start there--let it dry completely after washing it out, too. I think mine started to 'wheeze' as you say after I rinsed my filter, but it wasn't completely dry yet.
Sorry, there was a problem. Please try again later.You probably have something caught in the head you are using. Remove it and see if it does it without the head. If it does clean your filters.
Sorry, there was a problem. Please try again later.