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Thermistor Error and Jumping Temperature Readings

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Fast answer

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Treat sudden temperature jumps as a sensor or wiring fault: stop heating, inspect the sensor, connector, cable path, and configured thermistor type.

Hardware & SafetyIntermediate14 min

Progress

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Step 1

Stop the print and disable heaters.

Step 2

Allow the hotend to cool, then inspect the sensor and its insulation.

Step 3

Check the connector and cable through full toolhead movement.

Step 4

Confirm the sensor is retained correctly without overtightening.

Step 5

Verify the configured sensor type matches the installed part.

Step 6

Replace damaged sensors rather than splicing near the hotend.

Step 7

Run a supervised room-temperature and heat-up test.

Step 8

Recalibrate the heater only after the reading is stable.

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