Pwm fan stopped working during print/after



  • Hey guys, did my first long print (20+ hours). Got off work just after the print had finished, and when I started my next print my part cooling fan isn’t turning on.

    My fan is good (tested using always on side of the board) but will not work anymore on the pwm side, I tried all 3 headers with no success.

    Any ideas? I’ve been running this board and fan combo for the last roughly 6 months with no issues.

    Edit: looks like if i spin the fan by hand it will continue spinning at a very slow rate when connected to the pwm side of the fan headers


  • administrators

    Does it work properly if you connect it to one of the always-on outputs?



  • @dc42

    Yes, works fine on the always on side. I also dont see anything wrong with the board in the general area of the fan headers


  • administrators

    1. When you tested using all 3 PWM headers, did you make sure that none of them was set to thermostatic control?

    2. What M106 parameters are you using, in particular what PWM frequency?

    3. What type of fan is it?

    it seems unlikely that all 3 PWM fan outputs would fail at the same time. The usual cause is a short circuit in the fan wiring (ir a fan connected the wrong way round) fusing the supply voltage trace (or blowing the fuse on later Duets), but that causes the always-on outputs to stop working too.



  • @dc42 said in Pwm fan stopped working during print/after:

    1. When you tested using all 3 PWM headers, did you make sure that none of them was set to thermostatic control?

    2. What M106 parameters are you using, in particular what PWM frequency?

    3. What type of fan is it?

    it seems unlikely that all 3 PWM fan outputs would fail at the same time. The usual cause is a short circuit in the fan wiring (ir a fan connected the wrong way round) fusing the supply voltage trace (or blowing the fuse on later Duets), but that causes the always-on outputs to stop working too.

    1. thermostatic control has been turned off for all 3 fans

    2. Heres my Gcode for the fans, its what ive been using for the last few months.
      M106 P0 S0 I0 F500 H1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
      M106 P1 S0 I0 F500 H1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
      M106 P2 S0 I0 F500 H1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

    3. its a 5015 blower fan that supports pwm, bought off amazon



  • soo DC42, you are right. I had a bad crimp it seems so when i was testing other ports it was not working. but now fan2 and 3 work fine, only fan1 doesnt work.


  • administrators

    @stealthy_tt said in Pwm fan stopped working during print/after:

    M106 P0 S0 I0 F500 H1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off

    The H1 enables thermostatic control. Use H-1 to disable it.



  • @dc42

    Yeah I usually use H-1, but at the time was trying different things to get my part cooling fan going again.

    Do you know what part of the board went bad for Fan1? I know it has some power but it’s definitely not 12v.


  • administrators

    @stealthy_tt said in Pwm fan stopped working during print/after:

    @dc42

    Yeah I usually use H-1, but at the time was trying different things to get my part cooling fan going again.

    Do you know what part of the board went bad for Fan1? I know it has some power but it’s definitely not 12v.

    It will be the Fan1 mosfet, see https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers.


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