Clear all

[Solved] Can't Duplicate MinTemp Error with thermistor  

Trusted Member
Can't Duplicate MinTemp Error with thermistor

Hi all,

I have recently started getting sporadic MinTemp errors and have done a lot of troubleshooting (wiggling wires, checking resistance etc etc) but not matter what, I cannot find the problem.  Prusa is sending me a free replacement hot end thermistor, but it bothers me that I can't duplicate the error, other than while printing (which sucks obviously because I lose the print).

Any ideas on what could be going on here?

Posted : 31/08/2022 7:41 pm
Trusted Member
Topic starter answered:
RE: Can't Duplicate MinTemp Error with thermistor

Just an update on this. 

After a lot of troubleshooting, I have determined that some amount of vibration or movement of the Rambo board is causing this fault.  I had a replacement thermistor sent to me which did not solve the problem.  (note, the new thermistor appears to have a newer, more robust waxy/softer covering than the old version.  Likely an improvement from Prusa to address breakages with this sensor cable).   I also had swapped the thermistor connectors for the hot end and heat bed, and the error on the screen did not change away from the hot end.   This also indicated that the thermistor was not the root cause of the problem.

I can't consistently repeat the error, some times it comes when there is some vibration of the rambo (lightly tapping it), and sometime it doesn't.  Sometimes a powercycle makes the thermistor read again...and sometimes it doesn't.

Prusa is sending me a new rambo board.   Hope this helps someone in the future. 


Posted : 06/09/2022 5:27 pm