Can a computer fan send you a code?


Normally, when I turn on my cpu the fan goes to high speed for a second and normalizes. Lately, when I start my CPU the fan seems to send me a code in pulses. Similar to how some devises send an error code through a flashing light, but in this case a flashing fan; can a cpu fan send a code and are used like this? If not intentional, what would cause the fan’s sofeware to be changed or signal to the fan interrupted?

The fan sounds normal and silent as always and cpu is normal too.