How to Fix Thermal Runaway Protection Triggered
Step-by-step fix for thermal runaway protection triggered on Bambu Lab printers including X1C, H2D, P1S, and A1.
How do I fix thermal runaway protection triggered?
- 1
Check the thermistor wire for damage or loose connections at the hotend and mainboard. A faulty thermistor gives erratic readings that trigger protection.
- 2
Inspect the heater cartridge — ensure it sits snugly in the heater block with the grub screw tight. A loose cartridge causes heating failures.
- 3
If the bed triggers thermal runaway: check bed wiring at the connector (common failure point on Ender 3). Re-crimp or solder if corroded.
Pro tip: Thermal runaway is a safety feature — never disable it. Fix the underlying hardware issue instead.
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