12212
Moderate
Prusa · FDM 3D Printers
MAXTEMP Bed - Heated Bed Temperature Exceeds Safe Maximum
Quick Answer
Error code 12212 on your Prusa FDM 3D Printers means: MAXTEMP Bed - Heated Bed Temperature Exceeds Safe Maximum. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Power off the printer immediately
2
Inspect the bed thermistor mounting point on the underside of the heated bed
3
Measure thermistor resistance to check for short circuit condition
4
Inspect the mainboard for visual signs of MOSFET damage (burnt or discolored component)
5
Re-seat the thermistor with fresh thermal paste if the connection appears degraded
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Replacement bed thermistor
Thermal paste for thermistor mounting
Replacement Buddy/xBuddy board (if MOSFET failure)
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