Solved Toolhead board fault during hotend PID tuning

[Oxidize5]

Printer Model

Voron 2.4r2 (Formbot Pro+ Kit)

Extruder Type

Clockwork 2

Cooling Type

Stealthburner

I am running through the initial startup guide and have a very repeatable failure during hotend PID tuning. I can run `PID_TUNE_HOTEND` successfully at target temps of 200, 235, 240, and 241C. However, at 242 and above it fails after the temp passes the target and the heater goes from 100% to 0% with the following
```Klipper reports: SHUTDOWN

MCU 'EBBCan' shutdown: Thermocouple reader fault
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 have tried updating Klipper and rebuilding and reflashing the firmware in the SB2209/RP2040 via CANbus. Same result. I will checkout the crimps on the thermistor cable, but the repeatability suggests that it is not a cabling issue. Suggestions?

Klippy.log: http://0x0.st/87S3.txt

 

[shiftingtech]

I went into more detail on the discord, but in short you just have your extruder's temperature limits set too low for the temperatures you're trying to operate.

 

[Oxidize5]

Thanks once again.