2.1 Heated Bed or Hotend Thermistor Disconnection
2.2 Slicing Issues
3.1 Conduct print tests using random models.
3.2 Inspect the heated bed thermistor or extruder thermistor wiring, and reconnect the thermistor.
3.3 Individually heat the extruder and the thermistor to determine which module is problematic, and replace the corresponding parts.