Prusa MK4 Bed Leveling Failed: MINTEMP Error Diagnosis

WARNING: Electrical hazard. This appliance operates with high voltage or residual charges. Physical intervention is highly dangerous and it is strongly recommended to entrust it to a qualified specialized technician to avoid electrocution. ReeFix provides this diagnosis EXCLUSIVELY for educational and informational purposes.

Prusa MK4 Bed MINTEMP Diagnosis: The MINTEMP error of the bed on the Prusa MK4, with failed leveling and inconsistent first layer, indicates a critical problem in the bed temperature sensing circuit. The system detects a temperature that is too low, often due to a disconnected or faulty thermistor.

Causes and Probabilities:

1. Bed Thermistor Wiring/Connector (65%): The cable or connector of the Prusa MK4 Bed Thermistor is damaged by repeated flexing or has poor contact. This often happens with wear and tear.
2. Faulty Bed Thermistor (25%): The sensor itself is faulty, providing incorrect readings or is short-circuited.
3. Mainboard (10%): Rare, but a problem in the thermistor input on the Prusa MK4 Mainboard.

Quick Checks: Check the thermistor cables for breaks or pinches. Ensure the connector is securely inserted. For more in-depth tests, a Multimeter and a Precision Screwdriver Set are needed. Use Cable Ties for better cable management.

Decision: If the wiring is damaged or disconnected and you can replace the Prusa MK4 Bed Thermistor -> repair it yourself. Otherwise, for multimeter tests or suspected Prusa MK4 Mainboard -> contact a technician. Replacement is the last resort.