excessive humming from the module

While this is a 4-speed motor

Internal blockages from sediment or scale can occur within the 1/4" tubing over time

while 20x25 models require the 2

Mitsubishi Electric R01E22346 Filter Board 326070-701 excessive humming from the moduleThe Mitsubishi Electric R01E22346 Filter Board is a critical OEM replacement part designed for noise filtration and electrical stability in heavy duty outdoor units. As a primary power supply filter, this circuit board is engineered to suppress electromagnetic interference (EMI) and protect sensitive control boards from high voltage surges and signal distortion. Veterans in the field recognize this assembly as the necessary component for maintaining