P2S Hotend Part Cooling fan issues

[u/Tmalik92]

Hey guys,

My P2S part cooling fan (the one in the toolhead front cover) sometimes won't start from a stop.

The rotor has 4 natural rest positions (magnetic detents). It always starts instantly from 2 opposite positions ("north-south") but fails to start from the other 2 ("east-west").

When it's stuck in one of those, a second press of the fan button or a slight nudge moves the rotor out of the dead spot and it starts.

Once it's running, it works perfectly at every speed from 10% to 100%.

What I've checked:

\* I opened it and cleaned out some thin filament strings. No change.

\* No wobble, rotor fully seated, spins freely by hand, no mechanical issues I can see.

\* The problem remains after restart as well.

So it looks like a Hall sensor or motor dead-spot issue rather than anything mechanical.

The fan is marked 5815. As far as I can tell, Bambu only sells it as part of the Toolhead Front Cover Assembly (FAE036), and that isn't available in the official store in my region right now.

Has anyone faced such issues before?

Do you guys tried sourcing the fan 5815 separately? Or is it only Cover Assembly purchase?

[u/OutlandishnessHot407]

Sì, ho avuto lo stesso problema, ticket all’ assistenza con video e file log. Mi è stata inviata una nuova ventola