mainboard fan

[Aipoc76]

Did you test with a precompiled firmware?

Yes, and the problem still exists.

Bug Description

The fan for the motherboard CR 4.2.7 will only turn on when the part cooling fan turns on.

Bug Timeline

Just replaced a 4.2.2 board with a 4.2.7 board and it started.

Expected behavior

Motherboard fan to run all the time. (its not going to break any ones electric bill).

Actual behavior

Only turns on with part cooling fan. (Not the hot end cooling fan) but the printed part aka extruded material.

Steps to Reproduce

1. power on system
2. observe mainboard fan not spinning
3. turn on part cooling fan.
4. turn fan off again and see motherboard fan stop.

Version of Professional Firmware

Ender3V2-427-BLTUBL-MPC-20240125

Printer model

Ender 3V2 NEO

Electronics

4.2.7

LCD/Controller

Color V2 LCD

Other add-ons

running a 4020 fan on mainboard.

Bed Leveling

UBL Bilinear mesh

Your Slicer

Cura

Host Software

OctoPrint

Additional information & file uploads

No response

[mriscoc]

Not a firmware issue. Motherboard fan (K-FAN1) and part cooling fan (K-FAN2) are in parallel.

[Aipoc76]

thanks for the info. Where do you all find these drawings?

[mriscoc]

thanks for the info. Where do you all find these drawings?

https://www.reddit.com/r/ender3v2/comments/wglu9u/mainboard_fan_and_cooling_fan/

[classicrocker883]

i just wire mine with the hotend fan, because thats on all the time