# BLTouch behaves erratically after klipper update

**URL:** <https://klipper.discourse.group/t/bltouch-behaves-erratically-after-klipper-update/3405>\
**Category:** General Discussion\
**Created:** [July 9, 2022, 5:39pm UTC](https://klipper.discourse.group/t/bltouch-behaves-erratically-after-klipper-update/3405 "2022-07-09T17:39:05Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![phongshader](https://avatars.discourse-cdn.com/v4/letter/p/7bcc69/32.png) [@phongshader](https://klipper.discourse.group/u/phongshader)\
**Post date:** [July 9, 2022, 5:39pm UTC](https://klipper.discourse.group/t/bltouch-behaves-erratically-after-klipper-update/3405/1 "2022-07-09T17:39:05Z")

</div>

BLTouch was working as expected until I updated klipper to v0.10.0-515-g24a1b50e. Unfortunately I don’t remember what I updated from. I get these errors: **BLTouch failed to verify sensor state; retrying** , **Failed to verify BLTouch probe is raised; retrying** most times klipper recovers but sometimes it does not recover and errors out, **BLTouch failed to raise probe** and in the worst case klipper doesn’t acknowledge the BLTouch trigger at all and the bed crashes into to the toolhead. I can sometimes get through a Z\_TILT\_ADJUST but I can never complete a G29.

BLTOUCH\_DEBUG COMMAND=pin\_down - pin goes down, light goes off

BLTOUCH\_DEBUG COMMAND=pin\_up - pin goes up, red light goes on

BLTOUCH\_DEBUG COMMAND=pin\_down - pin goes down, light goes off

---

<div class="post-metadata">

**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\
**Post date:** [July 9, 2022, 7:53pm UTC](https://klipper.discourse.group/t/bltouch-behaves-erratically-after-klipper-update/3405/2 "2022-07-09T19:53:18Z")

</div>

I’m using a genuine BLTouch v3.1 and I update Klipper quite regularly. Did not notice any changes for a long time.

Had such errors and behavior already myself twice: One instance was a ramshackle wiring and in the other my BLtouch apparently decided to die during me working on the printhead and wiring while being powered on (should have known better - sometimes laziness needs to hurt).

---

<div class="post-metadata">

**Author:** ![phongshader](https://avatars.discourse-cdn.com/v4/letter/p/7bcc69/32.png) [@phongshader](https://klipper.discourse.group/u/phongshader)\
**Post date:** [July 9, 2022, 10:40pm UTC](https://klipper.discourse.group/t/bltouch-behaves-erratically-after-klipper-update/3405/3 "2022-07-09T22:40:06Z")

</div>

Checked the wiring, I guess I’ll try a new BLTouch.

---

<div class="post-metadata">

**Author:** ![olhev](https://avatars.discourse-cdn.com/v4/letter/o/54ee81/32.png) [@olhev](https://klipper.discourse.group/u/olhev)\
**Post date:** [July 15, 2022, 7:01am UTC](https://klipper.discourse.group/t/bltouch-behaves-erratically-after-klipper-update/3405/4 "2022-07-15T07:01:48Z")

</div>

Bltouch also tends to die (the magnet loses strength or maybe the flash memory gets corrupted?) if left for prolonged time above 60-80 °C, which is the case for enclosed printers with 100+ °C bed when printing small objects so that the probe is close to the bed.  
See

[![](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/4/4e4029d026ebeb3a88388954ec5be14acc7ccc15.jpeg "Faulty BLtouch: not stowing correctly (read description!)") ](https://www.youtube.com/watch?v=AJjYDmRgy1s)

---

<div class="post-metadata">

**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:** [September 23, 2025, 8:22pm UTC](https://klipper.discourse.group/t/bltouch-behaves-erratically-after-klipper-update/3405/5 "2025-09-23T20:22:02Z")

</div>