My processor fan keeps coming on?

I just cleaned my processor fan ang heat sink as it was clogged with dust. After i put everything back together the processor fan is coming on every 10-20 minutes or more if the computer is used. It is even coming on during the start up process. This did not happen before cleaning. Is there any chance that i will need to replace the termal paste or have i done something else wrong?
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  1. What processor is it?
    most hsf are on all the time, it sound as if you have fixed it, not that it is broken. however this is for new cpus so an older (ie p11 or p111 may be differnt)
  2. As a general rule of thumb though, if you removed the hsf to clean it, then you should replace the paste. Clean both surfaces and reapply.
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