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  1. #1
    Join Date
    Jun 2008
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    Question about York Affinity PV9 series

    Just got a new York 94% efficiency furnace with variable speed ECM motor. When the blower motor starts, it makes a bumping noise / vibration for about 5 seconds, rattling the ducts even. York contractor says all ECM motors do this on start. Can anyone experienced with these motors tell me if it is normal? Many thanks...

  2. #2
    Join Date
    Jan 2004
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    The ECM is checking its self for correct rotation. Its common for all ECM blowers to do it.
    If your ductwork is metal, he should have used a flex connector to isolate the furnace/AC coil from the duct.
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