I had a Redmax EBZ8500 develop a very noisy fan. Took it to dealer and they said it was a recall and replaced the fan. The unit was quiet for a few days then the noise started again. I looked at the replacement fan and it didn't look new to me either. What is causing this fan to be so noisy? So I can just fix it myself. When I say noisy I mean it sounds like a piston knock but it's not.
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