My MP mini’s original thermister broke so I swapped a new 100k N3950 thermister. Once I did, the temperature reading did not change and remained at N/A or some random below room temperature. I am unsure as to what I should do next to fix my MP mini. Thanks

That suggests that there is a break in one of the two wires. How did you do the replacement?

Did you splice the new one to the old one’s wires (and plug)?