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    The damper whistling is the bypass damper if I...

    The damper whistling is the bypass damper if I move the arm around it changes whistling noise
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    3 zones, damper whistling

    Hello-

    I have a fairly new home, 7 years. Zone heating and ac Carrier unit with attached humidifier. A couple months ago i started getting a whistling sound when only one zone is on. If all 3...
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