Anycubic error 10122 (Extruder Heating Abnormal) appears on the Kobra 3, Kobra 3 Combo, Kobra 3 Max, Kobra X, and Kobra S1 when the hotend fails to reach or maintain its target temperature within the allowed time. The printer halts immediately, as printing at an incorrect nozzle temperature risks clogs, under-extrusion, and potential damage to the hotend assembly.

What the Error Means

The hotend temperature is controlled by a heater cartridge embedded in the heater block and monitored by a thermistor. Error 10122 fires when the closed-loop PID controller cannot bring the nozzle up to the commanded temperature — indicating that the heater cartridge is not generating enough heat, the thermistor is returning a misleading reading, or power is not reaching the heater. Common causes include a loose heater cartridge cable, a loose thermistor cable, a burned-out or cracked heater cartridge, air drafts cooling the heater block, or a failed heater output port on the mainboard.

Step-by-Step Fix

1. Power off the printer completely and let the hotend cool to room temperature before touching any components — the heater block can retain heat for several minutes.
2. Locate the heater cartridge cable and thermistor cable at the hotend. Unplug both connectors and firmly reseat them, ensuring no pins are bent and the connector housings click into place. Repeat the same check at the mainboard end of each cable.
3. Inspect the heater cartridge visually for scorch marks, cracks in the ceramic body, or discoloration at the cable exit point. Any visible damage is grounds for immediate replacement.
4. With power off and the cables unplugged, use a multimeter set to resistance to measure across the heater cartridge pins. For a 24 V cartridge the reading should be 9–12 Ohm. A reading far outside this range or an open circuit confirms the cartridge has failed.
5. Verify the silicone sock is fitted over the heater block. The sock insulates the block and prevents ambient air or the part-cooling fan from stripping heat away. Replace a torn or missing sock before retesting.
6. Power on, command the hotend to 200 °C, and measure voltage at the mainboard hotend-heater port during active heating — it should be approximately 24 V DC. No voltage indicates a mainboard fault.
7. Replace the heater cartridge or full hotend assembly as required based on your findings above.

Parts Required

• Replacement heater cartridge (24 V, compatible with your Kobra model)
• Replacement hotend thermistor (if thermistor resistance is out of spec)
• Silicone sock for the heater block
• Multimeter

If error 10122 continues after replacing the heater cartridge and thermistor, contact Anycubic support to evaluate the mainboard.

Frequently asked questions

What does Anycubic 10122 mean?

Anycubic error 10122 (Extruder Heating Abnormal) appears on the Kobra 3, Kobra 3 Combo, Kobra 3 Max, Kobra X, and Kobra S1 when the hotend fails to reach or maintain its target temperature within the allowed time. The printer halts immediately, as printing at an incorrect nozzle temperature risks clogs, under-extrusion, and potential damage to the hotend assembly.

How do I fix Anycubic 10122?

Anycubic error 10122 means the hotend cannot reach its target temperature. Diagnose heater cartridge faults, loose cables, and mainboard issues on Kobra 3, Kobra X, and Kobra S1.