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Published on Jan 5, 2011
Our new Lenox heat pump makes this very loud racket when it's wet and cold out. Ice builds up on the fan blades and hits the housing. Our installer gave us a can of PAM to spray on the blades, which keeps them from building up ice for a while, and then must be re-applied. As of July 2011 Lennox has no fix. I suggest complaining to your installer every few months so they remember you have the problem if and when a fix comes out.