My CFS 4 is no longer loading filament in each of the 4 slots. When inserting the filament the blue light does come on, but the motor does not kick in to pull the filament in. If I place the filament in until the blue light comes on the printer does detect that filament is there, but when trying to have the printer extrude some filament the motor spins in reverse. The only error I get is that there is filament stuck. I have disassembled the CFS and found no filament jammed, and all of the tubes appear to be in good shape. I have also traced the line out to the printer and there is no jam that I can detect. In addition, the other 3 cfs units work and load/unload correctly. I have swapped cables and tubes with the working cfs units with the same result. It does seem to be just a CFS issue. Any thoughts?
It seems to be an sensor issue on the filament sensor which sits on the bottom in the splitter which merges the 4 tubes into the output.
Some have mentioned that they got similar problems when the CFS get’s too hot on top of the K2, then sensor may get ‘blind’ thinking that filament is there.
Did you raise a case with customer support already? It takes long to get any answer …
I have the same problem. I pulled the hub and the blue light on the filament detector circuit board for slot two is staying on and the switch works fine. So when I put a spool in the slot it wants to rewind it. It thinks there is filament when there is none. I also inserted a piece of filament in the other three slot the light comes on then goes off when removed.
Sorry I know this is an old thread but did you resolve the issue? I received a new CFS unit this morning, my 2nd unit and it’s all connected but the motor doesn’t seem to kick in, push the filament in and blue light comes on but that’s it.
I had the same issue as Haysonda. Eventually, Creality sent me a new 5-pass photoconductive adapter board. The same thing happened again on one of my other CFS. I couldn’t get them to send me a new sensor for each of my other CFS so I spent $30 for shipping and they sent me 3 new 5-pass photoconductive adapter boards. Of my 4 CFS I own, I have replaced the boards in 3 of them. I can only say that if you are having the issue that Haysonda describes then contact Creality to get a new board.
Have you seen this thread - read until the end to see solution.