SKR Pico fans don't work just heat up

General Discussion
1

Basic Information:

SKR pico
orangepizero2w
klippy.log

Fill out above information and in all cases attach your klippy.log file (use zip to compress it, if too big). Pasting your printer.cfg is not needed
Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there

Describe your issue:

… After days of problems installing mainsail i finaly was able to make it work
When was The time creating The printer.cfg, everything eles worked except The fans
I tested some Settings and nothing worked, they fans just heat up a lot and don’t rotate
I tested de out voltage with a multimeter and it’s 24.11v and then fan is 24v so I don’t see where they problem is

2

Hello @mimmiim !

Please do so to your next post.

1 Like
3

klippy (2).log (3.3 MB)
printer (2).cfg (1.7 KB)

there it is but idk why this happens, everyting else worked just fine.
just to inform that this is a modded crux 1 with the orange pi zero 2w and skr pico v1.0

4

Just to clarify: Fans that heat up? Wrong polarity?

5

yeah they heat up after some time, and i tried switching the wires and the same thing happened, maybe the board is with some problem

6

When a fan heats up and does not rotate, it is assumed to be broken.

7

Yeah I thought so , but I changed to a new fan but it didn’t move, I am trying to contact btt to clarify this situation

8

If you connect the fan directly to 24V power, does it move?

9

Yes , I also connected it to another 3d printer and it worked just fine, it’s just weird they heating It produces

10

Welcome mimmiim,

how many cables (connections) have your fans? Two, three, or four?
What is the manufacturer name and witch type are those fans?
A link to the datasheet is appreciated :winking_face_with_tongue:

11

2 pin fans, positive and negative , fans are from aimsolar 24v oil fans
Now searching they fan specs I think I can tweak they printer cfg file , the max power of the fan to match the fan specs

Screenshot_2025-06-30-15-54-38-333_com.android.chrome
Screenshot_2025-06-30-15-54-38-333_com.android.chrome1080×2460 199 KB

12

Try:

  1. Disconnect the fans.
  2. Set the fan’s output to fully on.
  3. Use a digital multimeter to measure the voltage across the relevant pins.

If the DMM does not read 24 V, then either your pin definition is incorrect (although it appears to be correct) or your board is faulty.

13

Datasheet was best wish.

What is written on the label of your fans? A photo would help.

14

finally after some time , i found an image that solves the issue

Voron0.1_Wiring_Diagram_SKR_PICO_V1.0
Voron0.1_Wiring_Diagram_SKR_PICO_V1.01920×2020 245 KB

1 Like
15

I completely misunderstood you, sorry.

If you need information about any (well, I guess not all) Bigtreetech (also known as BTT) products go here and do a search (_oo_gle search would give you of course the same results)

btt_github
btt_github1487×415 67.7 KB

If you would have searched for “pico”, you would have ended here GitHub - bigtreetech/SKR-Pico.
In the “directory” Hardware you’ll find the files you were looking for.