The MAXTEMP error occurs when at least one of the temperature readouts of the hotend is higher than 305 °C. It is a safety feature that prevents the printer from overheating uncontrollably.
The MAXTEMP BED relates to the heatbed and appears when the heated bed reaches above 125°C.
Troubleshooting
- A damaged thermistor cable may trigger the MAXTEMP error. Look for any overtightened zip-ties around the cables leading to the electronics board.
- If the printer heats up uncontrollably when first powered up after the assembly, and the MAXTEMP error is triggered, turn off the printer immediately and double-check your electronics assembly! Please refer to the following guides:Mini RAMBo electronics wiring (MK2S, MK2.5, MK2.5S) or Einsy RAMBo electronics wiring (MK3/MK3S/MK3S+).
- An occasional glitch - sometimes the heater can be tricked into overcompensating by a sudden blast of colder air. If this occurs, the heater can spike over the recommended temperature and trigger the error. Simply start the process again and monitor the printer just to make sure that everything goes well.
4. Inspect the G-code file or Slicer settings for incorrect temperature values.
10 comments
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Ninefingers
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I am currently experiencing this problem, I have replaced the thermistor four (4) times now thinking maybe I damaged it during the install. It works until it starts to map the bed level then errors MAX TEMP of 700+ then returns to zero. Reboot and it does the same thing.
Firmware was updated in 03-2025. Could the control board be failing?
Jason
Firmware was updated in 03-2025. Could the control board be failing?
Jason
Damien
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Firmware upgraded to 3.12.0-RC1. No problem anymore for PC-CF.
I print at 285°C with prusa PC-CF profile
I print at 285°C with prusa PC-CF profile
Daniel Scott
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I had this same issue with PC Carbon filiment. On the advice of Prusa support I updated to a new firmware on the printer and it fixed it. The firmware is currently in BETA but i imagine this will go into a normal release sometime in the future. Here the 3.12 BETA if anyone else needs it. https://github.com/prusa3d/Prusa-Firmware/releases/tag/v3.12.0-BETA1
Charles
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Thank you fou your comment. You just saved me hours of investigation as I am new to 3d print and just finished assbling my mk3s+ kit. everything was fine until I tried to print prusament PC CF. Same error but bed and nozzle temp were within normal limits. I flashed the beta version and everythint if ok now.
Hanzieo
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MAXTEMP error printing PC 110/275
I have a MK3S+and I just started printing Prusament PC with the X-nozzle. every print fail on MAXTEMP at differant heights. I have new prusa thermistor installad, same error. I actually saw it spike to 305deg momentarily. I assume this is open circuit or some other software error.
I have a MK3S+and I just started printing Prusament PC with the X-nozzle. every print fail on MAXTEMP at differant heights. I have new prusa thermistor installad, same error. I actually saw it spike to 305deg momentarily. I assume this is open circuit or some other software error.
Giuliano - Official Prusa CS
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Hello. Please try the firmware 3.12.0-RC1, which includes a new feature to stabilize the hotend temperature: https://github.com/prusa3d/Prusa-Firmware/releases/tag/v3.12.0-RC1