There are videos on Youtube where some of those have a defect where a single component blows and the unit gets warrantied. I think it was the MOV that goes open circuit but it might be something else. Since it is designed to protect the motor and the motor failed, some people just put in a jumper. Not sure if it acts as a supplementary protector or not, so if it was me, I'd play it safe and replace the ~$5 part if that was what failed.
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