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do auxiliary fans have brushes?

523 views 3 replies 3 participants last post by  samosali 
#1 ·
Mine aux fan did not start to rotate when hot days started. I gave several hits with a hammer to both of them and now they start just fine at same time. They also rotate smoothly.

I wonder what happened due to hammer impact ... but i am not sure if motor is brush-less or not.
 
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