I have same problems since some days, printer work fine before
then temp shows above 100/0 for hotend end around 124/0 for bed when turning printer on
changed hotend including temp sensor and also changed heatbed sensor (also sensor was measured 260 Ohms instaead of 100k at room temp)
so i had idea to change both sensors
but nothing changes, i checked all after installing new sensors, reading are fine nearly 100K for both sensors
but startup display shows same failure
if i start preheat bed and hotend for pla nothing happens
from beginning i got permanent trouble with my printer
after installing latest marlin 2.0 from vert i was very pleased with the results and it feels allright the first time
but since the last failure i am at the end i dont now how to solve this
maybe i need a complete system reset and a new clean installation or is the board at the end now???