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With a digital multimeter. Yeah, I figured that much. What leads should I be measuring exactly? I have almost no knowledge of how wiring works. Did I wire everything correctly on the bed at least? It still shows up as "def" when I turn it on and I dont know why. Everything should be working but its ...

If you are running the stock hot end and haven't messed with the thermistor settings in the firmware it sounds like a wiring problem. If you unplug the temperature plugs from the board and check the resistance at the leads you should get something near the 80-100 kohm range depending on your room ...

Ok, so I just finished putting together the v3 and when I turn it on. The Bed says ~24c but the hot end automatically goes to ~150c and stays there no matter what I do. I'll say "turn off all heat" and it still stays on. I can turn on the heated bed and it works just fine but It eventually will then ...