Creality error 2565 (Heat Bed Not Heating) is reported on K1, K1 Max, and K1C printers when the bed heater is commanded on but the bed thermistor shows no temperature rise within the expected window. The printer halts to prevent printing on a cold bed, which would cause immediate adhesion failure and potentially damage the printer.

What the Error Means

The heated bed circuit runs from a high-current output on the mainboard through a pair of heavy-gauge power wires to the bed heater element, with a separate thermistor wire returning temperature data. Error 2565 fires when the firmware detects no temperature rise from the thermistor despite commanding the heater on. Causes include a disconnected or broken bed heater power cable, a failed heater element (open circuit), a failed bed thermistor, or a mainboard output fault where the high-side switch for the bed heater is not closing.

Step-by-Step Fix

1. Power off the printer and allow the bed and electronics to cool before handling any wiring.
2. Inspect the heated bed power cable and thermistor cable where they connect at the bed surface and at the mainboard. Look for loose terminals, cable damage near the bed edge where the wire flexes, or connectors that have partially backed out.
3. Unplug and firmly reseat all bed cable connectors at both the bed and mainboard ends.
4. Use a multimeter to check the DC voltage at the bed heating port on the mainboard: power on, command the bed to 60°C, and probe the output terminals. The voltage will be PWM-modulated — a multimeter will show an average voltage between 0V and 24V. A reading that stays at 0V consistently while the bed is commanded on suggests a mainboard output fault.
5. With the printer off, disconnect the bed heater power leads and measure resistance between them with a multimeter. A healthy 24V bed heater typically reads 1–3 ohms; an open-circuit (OL) reading means the heater element has failed — replace the heated bed assembly.
6. Disconnect the bed thermistor leads and measure resistance. It should read approximately 100,000 ohms at room temperature for a standard NTC100K thermistor. A reading of 0 ohms or OL indicates a failed thermistor.
7. If the mainboard voltage output is confirmed absent (step 4), the mainboard requires replacement.

Parts Required

• Heated bed assembly (K1/K1 Max/K1C compatible) — if heater element is open-circuit
• NTC100K bed thermistor — if thermistor fails resistance check
• Replacement mainboard — only if bed heater output voltage is confirmed absent
• Multimeter

Contact Creality support if replacing the bed and thermistor does not restore heating — they can help confirm whether a mainboard replacement is warranted.

Frequently asked questions

What does Creality 2565 mean?

Creality error 2565 (Heat Bed Not Heating) is reported on K1, K1 Max, and K1C printers when the bed heater is commanded on but the bed thermistor shows no temperature rise within the expected window. The printer halts to prevent printing on a cold bed, which would cause immediate adhesion failure and potentially damage the printer.

How do I fix Creality 2565?

Creality K1/K1 Max/K1C error 2565 means the heated bed isn't raising temperature. Check wiring, heater resistance, and thermistor with this step-by-step guide.