The printer is showing the message "Check the heatbreak thermistor wiring for possible damage."
Error name: Heatbreak MINTEMP Error
Error code: #13211 (MK4) #21211 (MK3.9)
The error is shown when the heatbreak thermistor drops below 5 ºC at any point.
Access the LoveBoard. Check if the thermistor is connected correctly and if there is no damage along the cable length.
If you have a multimeter, it is possible to check the resistance of the cables to verify if they are damaged. For that, use our Multimeter usage guide.