HomeBrandsPrusaFDM 3D Printers12213
P
12213
Moderate
Prusa · FDM 3D Printers
THERMAL_RUNAWAY Bed - Heated Bed Temperature Unstable
Quick Answer
Error code 12213 on your Prusa FDM 3D Printers means: THERMAL_RUNAWAY Bed - Heated Bed Temperature Unstable. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
MINI+MK3.5MK3S+MK4MK4SXL
Likely Causes
  1. Bed insulation pad has detached from the underside of the heated bed
  2. Ambient temperature is too low for the bed heater to maintain target temperature
  3. Bed heater has partially failed reducing its effective wattage
  4. Large thermal mass object on the bed acting as a heat sink
How to Fix It
1
Check that the thermal insulation pad is present and adhered to the bottom of the heated bed
2
Run bed PID calibration from LCD > Settings > Temperature > Bed PID Calibration
3
Ensure the printer is not in a drafty location or near an air conditioning vent
4
Monitor bed temperature in PrusaSlicer or Pronterface to observe the heating curve
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Replacement thermal insulation pad
Replacement heated bed (if heater element degraded)
Printer enclosure
Related Error Codes
1220112202122031221112212
Video Guides
Loading video guides…
Search more on YouTube →