Why did my fan run all night?

Last evening I did a print on my X1C. It printed fine, and when I removed the printed parts, the printer’s fan was still on.

I woke up this morning to find out that the fan was still on. I couldn’t get it to turn off without turning off power.

The fan doesn’t turn on automatically when I turn the printer on, so it obviously isn’t supposed to be on all the time.

What might have caused this?

It will be helpful to know which fan you refer to.

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