Mcu keeps shutting down saying temps out

General Discussion
1

Basic Information:

Printer Model: ender 3 v2
MCU / Printerboard: BTT mini e3 v3
Host / SBC
klippy.log
klippy.zip (1.1 MB)

MCU ‘mcu’ shutdown: ADC out of range

Sensor ‘extruder’ temperature -99.585 not in range 0.000:300.000

Numerous sensors changed etc, just suddenly its decided to do this, was working fine past week, this machine has become such a pain in the rear…it has constant problems. I dont know where to start with this one, other then with what i have replaced, i have sat there watching and temps are holding then suddenly the above message appears even though the temp is clearly at desired temp.
…

2

grafik
grafik584×213 5.21 KB

Your extruder temp sensor is failing. Either wiring or defect sensor

3

Thats 3 in a row in a single day? thats gotta be a record lol…you think maybe my board could be shorting them?

4

The most likely problem is that you are overtightening the screw holding it in:

image
image1280×720 53.1 KB

This ends up breaking/shorting the conductors within the cables.

5

Its a tube style, not the glass bead thermisters…usually yes i would agreeand learnt that afew times.

6

Turns out the small connection i over looked was the culprit lol…opps

7

Make sure you don’t overtighten the grub screw with the tube style thermistor - you can damage it internally.