RE: Thermal Runaway with OctoPrint
@muelb
This most likely has nothing to do with Octoprint. Try printing from the SD card. I am sure that the problem will be the same there. As @cwbullet already noted - defective thermistor. Take a multimeter and measure the internal resistance of the thermistor. At 25 degrees C. room temperature it should show an approximate value of 100kohms. Possibly there is also a thermistor loose contact or short circuit.
Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.
RE: Thermal Runaway with OctoPrint
@karl-herbert
That is good advice. if it prints from the SD card - it might be octoprint.
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Chuck H
3D Printer Review Blog
RE: Thermal Runaway with OctoPrint
@karl-herbert
Since this happened and after cleaning up everything I did measure the thermostat and it was correct.
I put everything back together have have been running with no issues from the SD card since then. One day I will update and reconnect the Octo-print.