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Question DetailsAsked on 8/15/2017

Attic fan blades stopped working today, Thermostat and the motor that was replaced 60 days ago both work properly.

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2 Answers


You say the thermostat is working - so motor is turning on (or at least getting power to it) when hot up there.

If motor is working that means it is turning, but the fan blades are not ?

Sounds to me like when motor was replaced the tech did not test run the fan and retighten the fan assembly on the motor shaft. You are supposed to turn it on and off a half dozen times, letting it run up to speed each time, then retighten the setscrew or retaining bolt on the fan, because when it is put on the motor shaft it commonly is not at the tighted position - during use it loosens up a bit.

Depending on whether it has worked on the shaft a lot and damaged it (in which case motor would have to be replaced again or the blade aseembly repalced, depending on which is made of the hardest metal), or maybe the setscrew or retaining bolt fell out (or was left out during the replacement) and the fan is just spinning on the shaft, if it has not worked loose you might just be able to replace/tighten the retaining bolt or screw. But if it has been sitting there and spinning for an extended period of time (not just one day) as the fan cycles oin and off, most liikely is now quite loose on the shaft and both are probably damaged.

Sounds like time to cut power to the fan to avoid further damage, then call the tech back who replaced the motor to repair/replace at no cost to you, because this definitely sounds to me like a failure to remount the fan correctly.

Answered 3 years ago by LCD


OK - saw your comment on the erroneous thumbs-down - follow up response at your other post here, which continues the saga -

Answered 3 years ago by LCD

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