ADC out of range Sensor 'extruder' temperature -74.317 not in range 0.000:500.000

General Discussion
1

Basic Information:

Printer Model: Ender 3 Pro Modified
MCU / Printerboard: BTT Mini E3 v2/BTT EBB42
Host / SBC RPi 4b 4gb with CAN HAT
klippy.log

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Describe your issue:

…
Got the TZ E3 V3.0 to swap to my Ender 3 Pro and am getting the following:

MCU ‘can0’ shutdown:

This generally occurs when a heater temperature exceeds
its configured min_temp or max_temp.
Once the underlying issue is corrected, use the
“FIRMWARE_RESTART” command to reset the firmware, reload the
config, and restart the host software.
Printer is shutdown

I already switched the TH0 to Generic 3950 but still get the same math error. I did not set a custom thermal profile so I am guessing that this is a bad thermal probe?

klippy.log (455.7 KB)

2

It can also be a wiring error - you didn’t indicate when you put in the EBB36. If it was done with the TZE3 then there might be a problem with the connector.

Regardless, it’s a problem with the thermistor.

3

Nope the CANBus stuff has worked great and has been set up for some time. I am not sure why the Generic 3950 is doing inverted maths since it is not a polarized sensor. I do have another 3950 on order so I may just go back to my prior all metal instead of the TZ-E3 v3.0 until that comes in.

This hotend came pre-assembled so I did not verify the bulb was ok.

4

The temperature isn’t doing “inverted maths”, it’s reading the temperature as being that low.

The resistance of an NTC thermistor decreases as the temperature goes up.

When you get a very low temperature, it generally means you have an open circuit which could be thermistor being completely bad or there might be a problem with the connector.

5

Yep, replaced the thermistor and am 100% again.