Front facing fan isn't coming on

[sleepylight 0]

I have 2 Ultimaker S5s, and for the most part they have been quite reliable.  However, on one of them, the front facing fan inside the fan bracket has stopped working.  I'm not sure if the fan itself is the problem, or the printer just isn't activating it.  Are there any utilities for verifying that the fan is working?  I adjusted the fan speed while printing and it only seems to adjust the side fans used to cool the bed.

 

This has become a real problem because my PLA keeps melting inside the feed tubes, or above the nozzle.  This jams the whole printer, and I have to spend a lot of time cutting out bits of filament without damaging the printer.  I've attached a picture of the melted filament the last time everything got stuck. 

 

Any guidance would be appreciated.

 

-Max

[Smithy 1,146]

The front fan is for cooling the hot end and is enabled automatically when then print core is over 40°C, you cannot control the fan from Cura.

 

If the fan is not running then check the cables, maybe they are broken or the connector. Another reason could be that some material is blocking the fan, 

[Elfonerio 5]

I had some hair like strands get wrapped around the shaft of the fan and that caused the fan to quit working.  I used a fine tip tweezers to pull it out.

[sleepylight 0]

I pulled the fan connector out, and connected a 5v power supply to the fan.  As soon as I gave it power, the fan spun up.  So, I'm confident that the fan side wiring harness and the fan itself are both fine.

 

I then reconnected everything and brought both print cores up to 150 degrees.  The display on the font of the S5 appears to read the temperature correctly, but even after several minutes, the fan didn't come on.  Is there another part I could look at?

[RudydG 62]

If the fan works standalaone, you could check the voltage on the connector when the cores are hot, check for 5V dc.

Maybe it is the wiring, maybe even the motherboard.

In my case, it was a blocked fan. I cleaned all the mess out, and everything worked fine again. (took me some time to find out why this machine gave me troubles)

[Nikonswede 0]

Had same issue.... broke the fan trying to untangle it 😞 

 

Waiting on new fan from Ultimaker.