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Discussion Starter · #1 ·
My Filstar XP2 makes this high-pitched hum. It's really annoying. It hasn't always done this; it started doing it about 2 years after I bought it. Any idea what's causing the hum and whether I can do anything about it?
 

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I was just going to recommend looking at the impeller but figured it was too obvious. That is the first thing I would investigate.

It is almost always the impeller that goes bad. Might want to check it out.
 
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