Creality error 2564 (Nozzle Not Heating) appears on K1, K1 Max, and K1C printers when the hotend heater is commanded on but the thermistor reading shows no temperature rise. The printer cannot safely operate with an unresponsive heater and halts immediately to prevent filament jams and potential hardware damage.

What the Error Means

The nozzle heating circuit consists of a heater cartridge (a resistive element that converts electrical power to heat) and a thermistor that measures the resulting temperature rise. Error 2564 fires when the firmware commands heating but the thermistor reports no increase within the expected time window. This can mean the heater cartridge is open-circuit (burned out or disconnected), the thermistor is reading incorrectly (masking actual heating), a wire has broken at the hotend, or the hotend board has a fault that prevents power from reaching the heater.

Step-by-Step Fix

1. Power off the printer and allow all components to cool fully — the heater and nozzle may retain heat even if error 2564 fired early.
2. Inspect the heater cartridge wires and thermistor wires where they enter the hotend block. Look for loose terminals, broken insulation near the heater block, or wires that have pulled out of their crimps.
3. Unplug and firmly reseat all hotend connectors at the hotend board.
4. Use a multimeter set to resistance (ohms). Disconnect the heater cartridge leads and measure resistance across them — a healthy K1-series heater cartridge reads approximately 10–20 ohms at room temperature. An open-circuit (OL) reading means the cartridge has failed; replace it.
5. Disconnect the thermistor leads and measure resistance — a standard NTC100K thermistor reads approximately 100,000 ohms at 25°C. A reading of 0 ohms or OL indicates a failed thermistor; replace it.
6. If the heater and thermistor measure correctly, inspect the hotend small board for burn marks, damaged traces, or a blown component. Replace the hotend board if damaged.
7. Update the printer firmware via Settings → About as a final step, as firmware bugs on early K1 builds occasionally caused false heating failure reports.

Parts Required

• Heater cartridge (K1/K1 Max/K1C compatible, typically 24V)
• NTC100K thermistor (K1/K1 Max/K1C compatible)
• Hotend small board — only if board damage is confirmed
• Multimeter

Contact Creality support if the error persists after replacing the heater cartridge and thermistor with confirmed-good parts.

Frequently asked questions

What does Creality 2564 mean?

Creality error 2564 (Nozzle Not Heating) appears on K1, K1 Max, and K1C printers when the hotend heater is commanded on but the thermistor reading shows no temperature rise. The printer cannot safely operate with an unresponsive heater and halts immediately to prevent filament jams and potential hardware damage.

How do I fix Creality 2564?

Creality K1/K1 Max/K1C error 2564 means the hotend heater isn't raising temperature. Diagnose heater cartridge, thermistor, and wiring with this guide.