Prusa Error 13213: MCU MAXTEMP, the Board and Not the Hotend
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Prusa error 13213 means the microcontroller on the control board is overheating — not the hotend, not the bed. The usual cause is the electronics fan: stalled, choked with dust, or unplugged after maintenance. Ambient heat and an enclosure with the board inside are the other two common reasons.
The number is easy to misread as another hotend fault because it sits in the same temperature category. It is not. The sensor that tripped is on the board, and every fix is in the electronics bay.
Where to buy
YOOPAI 3D Printer Enclosure for Creality Ender 3 with Ventilation Kit & LED
Check in this order
- The board fan. Power on and listen, then look. A fan that spins slowly, rattles, or does not start is the single commonest cause. Dust on the blades is enough.
- Vents and clearance. Anything resting against the electronics bay, or a printer pushed hard against a wall, blocks the airflow path.
- Ambient temperature. A hot room plus a long print is enough on its own in summer. Measure it rather than guess.
- Enclosure design. If you have enclosed the printer, check whether the electronics ended up inside the heated volume. Commercial enclosed machines deliberately keep the board outside for exactly this reason — see building an enclosure.
Why an enclosure makes this worse
Enclosing a printer to print ABS or ASA raises the air temperature around everything inside it, including the control board. On a machine whose electronics sit in the base, that is a design assumption you have just broken. The fix is ventilation for the electronics bay specifically, not for the chamber.
Fan replacement notes
Match the size and voltage rather than buying the quietest thing available — a lower-airflow fan can clear the error and then let it come back in warm weather. What the different fans on a printer do is in cooling fans.
Related codes
13205 is the heatbed sensor above range, 13211 the heatbreak sensor below range, and 13204 thermal runaway on the hotend. On other models this error reads 12213 (MINI), 17213 (XL), 31213 (CORE One) or 23213 (MK3.5).
Another overheating code that is not the hotend: on a CORE One, 31260 means the chamber itself is above its safety limit.
Prusa Error 13213 FAQ
Is my hotend overheating?
No. 13213 is the processor on the control board. The hotend has its own separate codes.
Why did this start only in summer?
Because ambient temperature adds directly to the board temperature. A machine that is fine at 20 °C can trip at 32 °C with no hardware fault at all.
Can I ignore it if prints still finish?
No — the printer stops. And sustained high temperatures shorten the life of the board even when they do not trip the limit.
Does an enclosure cause error 13213?
It can, if the electronics sit inside the heated volume. Ventilate the electronics bay separately, or move the board outside the enclosure.
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