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It is strange, the bathroom fan is buzzing and humming when I first turn it on. After a few minutes, it starts up normally.

Why is it doing this?

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up vote 3 down vote accepted

Sticky old oil in the bearings. After buzzing (and probably turning very slowly) for a while, the motor heats up enough for the oil to liquify, and then it runs normally.

Try fresh oil if the bearings have a place to apply oil, or consider a new fan. This is a common problem with old fans.

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Last night it stopped and never run again, is it still repairable? – Love Jan 17 '14 at 13:45
Sounds like it's time for a new one. You might be able to replace the motor, but this usually only makes economic sense when you can't just replace the whole fan for some reason. – Ecnerwal Jan 18 '14 at 1:47

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