6 replies

temperature on one toolhead reads strange

I recently had to take off the toolheads on an IDEX vc4, and when putting back both were having crazy out of range values for both extruder temperatures. I assumed wires were bad, as it appeared to be reading random analog values from the pin (which I would expect when no connection exists) so I figured I accidentally screwed up the wires whne reconnecting. I had to replace the thermistors at some point as I had cut the wires too short during the initial build so figured now would be the time. I installed 2 new PT1000s in each hotend and connected up. T0 started up fine, but T1 did not. But what's somewhat strange is it's not reading random values on the pin, it's reading a constant -127 degrees. Like it's actually getting data, but it's just strangely off. I can even turn on the hotend and it heats up, all temps being read at that ~127 degree offset. I turn off the heat and it goes back down to -127. If I pulll out the thermistor from the EBB42, I'll see the normal crazy analog values I woudl expect when there is nothing on the pin. And when I put it back it will go back to reading a stable/constant temp, albeit wher I woudl expect ~23 for room temp it';s actuall ~-127. Anyone have any thoughts as to what could be going on?

Solution

@TheTik thank you very much. That was it. Missing jumper, put it back on and back to good as new