Hello! I have an UM2+ and has been working flawlesly for over 1year. This morning, I encountered the problem, that it was clogging during print, and sometimes at the beginning of the print while purging. After checking with an external thermisor, the read temperature was 145 and it was set to 235. How can I check if the thermistor is faulty before buying a new one? Any other suggestions? Thank you!