I have a carrier motor master 3

magnetek 3p-vs1 which requires the VS-101 motors which I have.

I have an issue I have seen before and cannot remember the cause.

The thermister is good

At a certain resistance range ,which equals around 80F, the fans do not turn ,they just shake really bad and make a god awful noise . I can short the resistor so they run full speed and the motors appear fine.

I know someone else has encountered this .

Yes ,I know they are junk .....noy going to put mm5 on either . I want to know why...