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There is a circuit board....the blower wires attach to this board.
The motor has different speeds but can be adjusted for higher or slower depending on the customers wishes.
How long ago was board replaced?
are you willing to swap a few wires with direction?
all i need is furnace model number
study page 46-47 HERE and tell me if you understand the settings. You will need to read the entirety to see what A,B,C,D means as it relates to air flow on the chart according to your model number.
Setting these switches controls the cfm (amount) of air.
If you do not understand these settings, I will need to know your current dip setting in order to guide you the correct direction.
thank you...and what function is the one that is too loud?