What happened?
This warning appears when the Dwarf board toolhead’s microcontroller unit (MCU) exceeds its safe temperature range. The printer displays the message: "MCU in Dwarf is overheated, likely due to exceeding the printer's operating temperature. Prevent overheating for optimal performance".
Error name: DWARF_MCU_MAX_TEMP
Error code: #17826 (XL)
How to fix it?
This warning typically appears when the ambient temperature around the printer is too high, or when the printer is enclosed without proper ventilation.
- Ensure the printer is used in an environment with ambient temperature below 30 °C (86 °F).
- If you're using a custom enclosure, ensure it has sufficient passive or active airflow to prevent heat buildup. Avoid sealed or poorly ventilated designs.
- The Original Prusa XL Enclosure is engineered for safe thermal operation. However, prolonged operation in an already warm room can still contribute to this issue.
- Temporarily open the enclosure door to improve airflow.
- Allow the printer to cool down: turn it off and let it rest for at least 10–15 minutes before continuing.
- With the printer fully cooled down, check for dust or obstructions around the toolhead that may trap heat.
If the issue persists even in a cool environment, contact our Support for further diagnostics, as the internal sensors or electronics may be faulty.
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