“Why is there a constant piercing sound on top of the regular sound ?”

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• No piercing sound from my unit. It's Very quiet.

  Answered by MaNana 3 years ago

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• There should not be any type of sound, outside of the normal fan noise. Please be sure the back panel is on securely and the filter is not dirty.

  Answered by GuardianTechnologies 4 years ago

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