By the way, I doubt the temp sensor electronics is broken. I've never heard of this. But the sensor itself can definitely fail. There is no solder inside the temp sensor (it would melt) so it is just crimped. When you heat and cool this, the resistance can increase which makes the printer think the temp sensor is hotter than it is and you end up with a warm (but not hot) nozzle. Or it can fail completely (open circuit).
Did you measure the resistance of the temp sensor with an ohm-meter? You have to disconnect the temp sensor from the ultiboard first as that will throw off your measurement. The PT100 should be around 109 ohms at room temperature (and 100 ohms at 0C).
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gr5 2,224
All your edits will be in pins.h. Concentrate on that file. There are instructions on how to rebuild the firmware here:
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