# Ender3 S1 very frequent shutdown error

**URL:** <https://klipper.discourse.group/t/ender3-s1-very-frequent-shutdown-error/23470>\
**Category:** General Discussion\
**Created:** [May 16, 2025, 12:23am UTC](https://klipper.discourse.group/t/ender3-s1-very-frequent-shutdown-error/23470 "2025-05-16T00:23:54Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![magiwogg](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@magiwogg](https://klipper.discourse.group/u/magiwogg)\
**Post date:** [May 16, 2025, 12:23am UTC](https://klipper.discourse.group/t/ender3-s1-very-frequent-shutdown-error/23470/1 "2025-05-16T00:23:54Z")

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### Basic Information:

Printer Model: Ender 3 S1  
 MCU / Printerboard: STM32F401  
 Host / SBC Raspi 3B+ as klipper, with latest version  
 klippy.log  
[klippy.log.zip](https://klipper.discourse.group/uploads/short-url/wO2p0G40El85YJg9F1fawrTMYfg.zip) (473.7 KB)  
[moonraker.log](https://klipper.discourse.group/uploads/short-url/tLQV7G89el4g4FagwfCLemomawZ.log) (110.3 KB)

 ![IMG_9027.PNG](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/a/b/ab5247864d2947cff4425b23729f5142ed2d66bc.jpeg)

### Describe your issue:

I tried my best to prevent this mcu disconnection error, but after modding it even frequently shuts down!

Here is what I had tried so far, but there could be flaws.  
I read klippy.log but I think there is no thermal issues(or I am just too noob to read it)  
Thanks in advance for any suggestions / advice!

-latest 2 modification that is suspicious-  
-better cooling fan for mcu control board in printer(larger noctua fan, using buck converter to connect it)  
-GPIO power supply directly from AC to 5v/gnd pins

other things  
-better cooling fan for raspi  
-shielding 5v+ on usb cable  
-robust usb cable with cable holder  
-updating printer’s firmware again  
-updating klipper and other components(this could be also suspicious…)

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**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\
**Post date:** [May 16, 2025, 5:44am UTC](https://klipper.discourse.group/t/ender3-s1-very-frequent-shutdown-error/23470/2 "2025-05-16T05:44:26Z")

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Hello @magiwogg !

You may read here: [Timeout with MCU / Lost communication with MCU](https://klipper.discourse.group/t/timeout-with-mcu-lost-communication-with-mcu/6639/1)

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<div class="post-metadata">

**Author:** ![magiwogg](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@magiwogg](https://klipper.discourse.group/u/magiwogg)\
**Post date:** [May 16, 2025, 9:49pm UTC](https://klipper.discourse.group/t/ender3-s1-very-frequent-shutdown-error/23470/3 "2025-05-16T21:49:33Z")

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yes, I already read that topic, but I could not solve anything…

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\
**Post date:** [July 15, 2025, 9:50pm UTC](https://klipper.discourse.group/t/ender3-s1-very-frequent-shutdown-error/23470/4 "2025-07-15T21:50:17Z")

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