York Excessive Air Velocity / Duct Static Pressure Problem

York indoor unit produces loud whistling or roaring noise from vents

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Undersized ductwork, Too many closed registers, Blower speed set too high, Dirty filter causing high static

Safety: Turn off power before changing blower speed taps or ECM settings.

Open registers: Ensure most supply registers are open to reduce restriction.
Replace filters: Install clean filters with appropriate MERV rating; overly restrictive filters can increase noise.
Adjust blower speed: On York air handlers, move the blower motor lead to a lower speed tap for cooling (PSC) or adjust ECM airflow settings per manual.
Consult a duct specialist: If noise persists, duct modifications may be needed to reduce static pressure.

Medium 3/5

Blower Motor Speed Tap / ECM Module

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