MINTEMP

Updated 5 months ago ​by Tomáš Chvalina

The MINTEMP error occurs when at least one of the temperature readouts of the hotend or the heatbed drops below 16°C. It is a safety feature which prevents the printer from overheating in case of a faulty thermistor.

Make sure to distinguish between the MINTEMP error and the MINTEMP BED error. 

  • MINTEMP - problem with the hotend temperature readout
  • MINTEMP BED - problem with the heatbed temperature readout

Troubleshooting

For pre-assembled printer owners: If you happen to receive the printer during the winter and you want to start using it out of the box, wait until it reaches room temperature. 

MINTEMP

  1. Make sure that the ambient temperature is not below 16°C.
  2. The error might have been caused by a simple glitch, so try to reset your printer with the reset button and see if it is possible to operate it normally afterwards.  
  3. Check that the thermistor is properly plugged into the electronics board. You can doublecheck that by following the MK2/MK2S Electronics Wiring or MK3 EINSY miniRAMBo electronics wiring guides.
  4. Look for any damage to the thermistor cable or thermistor leads. In case there's visible damage, the thermistor must be soldered or replaced. You can also test it with a multimeter, if it fails to read the resistance (infinite resistance), then the leads are broken and the thermistor must be replaced (Semitec 100kOhm NTC Thermistor. 104GT-2).
  5. Electronics board thermistor input is broken. Highly unlikely, as the board would fail to pass the final testing on our test bench. If only one temperature readout shows 0°C. Try switching the Hotend and Heatbed thermistors on the board, if the faulty readout remains the same, the electronics board is broken. New board is needed.
  6. If the issue persists or you are not able to find the source of it. Then you can perform a simple test described below, which tests the thermistor readings.

MINTEMP BED

  1. Make sure that the ambient temperature is not below 16°C.
  2. The error might have been caused by a simple glitch, so try to reset your printer with the reset button and see if it is possible to operate it normally afterward. 
  3. Check that the thermistor is plugged correctly into the electronics board. You can doublecheck that by following the MK2/MK2S Electronics Wiring or MK3 EINSY miniRAMBo electronics wiring guides.
  4. Make sure that the heatbed thermistor is firmly attached to the underside of the heated bed with the golden Kapton tape. If not, then simply put it back and make sure that the thermistor cable has some space for movement.
  5. The thermistor cable might be wearing down. This can be observed if the temperature starts randomly jumping up and down during the Y-axis movement. Look for any overtightened zip-ties around the cables leading to the electronics board. In the case of a broken thermistor cable, the thermistor must be soldered or replaced.
  6. Electronics board thermistor input is broken. Highly unlikely, as the board would fail to pass the final testing on our test bench. If only one temperature readout shows 0°C. Try switching the Hotend and Heatbed thermistors on the board, if the faulty readout remains the same, the electronics board is broken. New board is needed.
  7. If the issue persists or you are not able to find the source of it. Then you can perform a simple test described below, which tests the thermistor readings.

Testing the thermistor 

It is not very common, but there is a chance that the thermistor itself is defective. You can check its functionality with the following test: 

  1. Find a hair dryer and blow hot air at the heatbed or hotend.
  2. In the meantime, check if there is any temperature change on the LCD.
  3. If there is a positive temperature change, it means that the heatbed or hotend thermistor is working. 
  4. If there is no change at all, the hotend or heatbed thermistor is defective and must be replaced. 

Do not hesitate to contact us at info@prusa3d.com if you have any further questions.


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