Prusa 3D Printer Error Code 0: How to Fix It

Medium 30-60 minutes Critical Severity Verified June 2026
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Error Code
0
Brand
Prusa
Product Type
3d_printer
Severity
Critical
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error Code 0 on your Prusa 3D printer indicates a thermal runaway condition, meaning the printer detected that the temperature of the hotend or heated bed is rising uncontrollably or not responding as expected. This is a critical safety feature to prevent fires. The fix involves checking the thermistor, heater cartridge, and wiring connections.
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Tools You'll Need

How to Fix Error Code 0

  1. Power Off and Unplug the Printer

    Always unplug the printer before servicing to avoid electric shock or burns from hot components.

  2. Inspect Thermistor and Heater Cartridge Connections

    Be gentle with the thermistor wires as they are fragile and can break easily.

  3. Check Thermistor Resistance

  4. Examine Heater Cartridge

    Do not power on the printer while testing resistance to avoid electric shock.

  5. Verify Wiring Integrity

  6. Check Mainboard for Damage

    Only open the mainboard enclosure if you are comfortable with electronics. Otherwise, seek professional help.

  7. Reassemble and Test

    Never leave the printer unattended during the first test print after repair.

Parts You May Need

Thermistor (NTC 100k)
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Heater cartridge (12V or 24V)
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Mainboard (e.g., Prusa Einsy RAMBo)
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Thermistor (NTC 100k)
Check Price on Amazon
Heater cartridge (12V or 24V)
Check Price on Amazon
Mainboard (e.g., Prusa Einsy RAMBo)
Check Price on Amazon
Thermistor (NTC 100k)
Check Price on Amazon
Heater cartridge (12V or 24V)
Check Price on Amazon
Mainboard (e.g., Prusa Einsy RAMBo)
Check Price on Amazon
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When to Call a Professional

If you are uncomfortable working with electronics, or if the mainboard or hotend needs replacement, seek assistance from a qualified technician. Also, if the error persists after all checks, professional diagnosis may be required.

Frequently Asked Questions

What does Prusa thermal runaway error 0 mean?
It means the printer detected a temperature that is not responding correctly to heating, which could indicate a failing thermistor, heater, or wiring. This safety feature shuts down the printer to prevent fire.
Can I bypass thermal runaway error on my Prusa?
No, never bypass thermal runaway protection. It is a critical safety feature to prevent fires. Always fix the underlying issue.
How do I PID tune my Prusa printer?
You can run PID autotune via the printer's LCD menu (Settings > Temperature > PID autotune) or via G-code commands like M303 E0 S200 C8 for the hotend. Follow Prusa's guide online.
What thermistor does Prusa use?
Most Prusa printers use a NTC 100k thermistor (Semitec 104GT-2 or compatible). Check your printer's manual for exact specifications.
How often should I check my Prusa's thermistor and wiring?
Visually inspect the wiring and thermistor connections every few months, or if you notice temperature fluctuations. Replace any damaged components immediately.

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