Error 102 on the Elegoo Centauri Carbon and Centauri Carbon 2 Combo indicates the firmware cannot obtain a valid temperature reading from the heated bed NTC thermistor. Without a reliable bed temperature signal the printer cannot safely heat or level, so it halts immediately.

What the Error Means

The bed NTC thermistor is a small temperature-sensing resistor mounted under or on the heated bed surface. It reports real-time bed temperature to the motherboard. Error 102 fires when the thermistor reading falls outside a plausible range — typically because the thermistor cable connector is loose or disconnected, the thermistor wires have been kinked or cut along their run, or the thermistor itself has failed (open or short circuit). This error is distinct from error 101, which targets the heater element; error 102 is entirely about the temperature sensor.

Step-by-Step Fix

1. Power off and unplug the printer fully before inspecting any wiring near the bed.
2. Locate the bed thermistor connector on the motherboard — it is typically a small two-pin or JST connector separate from the heater cable. Unplug it, inspect the pins for corrosion or bent contacts, then reseat it firmly.
3. Trace the thermistor wires from the motherboard back to the heated bed. Look for kinks, cuts, pinch points where the bed frame might trap the cable, or heat damage near the bed edge.
4. Measure thermistor resistance with a multimeter at room temperature. NTC thermistors typically read around 100 kΩ at 25 °C, but confirm the exact value in the Elegoo Centauri Carbon wiki. A reading of zero or infinity (OL) indicates a failed thermistor.
5. If the thermistor is out of spec, order a replacement bed thermistor that matches the Elegoo Centauri Carbon specification and install it per the wiki guide.
6. If the thermistor tests in spec, re-flash the printer firmware using the file from the official Elegoo wiki to rule out a software fault causing a false reading.
7. Power on and confirm the bed temperature displays a realistic ambient value (18–30 °C) before attempting a heat test.

Parts Required

• Replacement bed NTC thermistor (match Elegoo Centauri Carbon specification)
• Multimeter (for resistance measurement)

If the error persists after replacing the thermistor and re-flashing firmware, contact Elegoo support — a damaged motherboard thermistor input circuit may require board replacement.

Frequently asked questions

What does Elegoo 102 mean?

Error 102 on the Elegoo Centauri Carbon and Centauri Carbon 2 Combo indicates the firmware cannot obtain a valid temperature reading from the heated bed NTC thermistor. Without a reliable bed temperature signal the printer cannot safely heat or level, so it halts immediately.

How do I fix Elegoo 102?

Elegoo error 102 signals an invalid bed thermistor reading on the Centauri Carbon. Learn to diagnose a loose connector, damaged wire, or failed NTC thermistor.