What a Failed ECM Motor Module Sounds Like | Replacing a Variable Speed Blower Motor

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In this video, I diagnosed a bad ECM blower motor on a Lennox furnace.
This variable-speed blower motor changeout was so stubborn, it took me around 45 mins just to remove the blower wheel from the shaft!

One of the ways to know that you have a bad motor module, is you'll sometimes hear a thumping noise at start-up. These motors are very susceptible to high static pressure due to under-sized ductwork or an oversized system - causing the motor to overheat.

Don't forget, whenever performing this ac repair, make sure to tighten that set screw!
Thanks for watching!

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