Temperature are are shown all negative bed and extruder

Comments

• Repetier

  November 2019

  Wrong analog input might be a reason. If not connected they show hottest or coolest temperature in table. Same goes if the checked analog pin is not the one where the sensor is connected to. Not that the ramps has so many inputs. Also make sure that you have a thermistor and not a thermocouple and that is really of that type.
• lmcbmai

  November 2019 edited November 2019

  I recently finished building new printer and was also getting negative temperatures when thermistor was not connected.
  Check your wiring, if you have a tester, measure resistance of the thermistor (typically should be close to 100 kOhm), make sure you have correct pin assigned.
  To narrow down the problem you can temporarily replace thermistor with 100K resistor directly attached to sensor connector on your board and check if the reading changes. 
• beginner

  November 2019

  Thank you for answering.
  
  The thermistor seems to be o.k. I measure 110kOhm (100kOhm=25°C). When I heated up the thermistor with my hand the measured temperature will also goes higher up to 35°C . 
  
  It is possible the repetier software show the temperature values always with "minus" in front ? when I look at the temperature curves the value seems to be positiv and  the graphical LCD Display show  also positive values.
  
  I ´m a little  confused now.
• lmcbmai

  November 2019

  when I look at the temperature curves the value seems to be positiv and  the graphical LCD Display show  also positive values.
  

  So, where do you see negative values?
• RAyWB

  November 2019

  if you mean repetier host , it´s not a minus sign but simply a hyphen followed by a space.
• beginner

  November 2019

  Thanks all . I were wrong I tought it were a minus sign in repetier Host and I investigate a Couple of hours for Troubleshooting . So learning by doing.