@dc42 I had double and triple checked the wiring and thought everything to be ok even moved the head around manually and tapped the bed with no issues. I went ahead and secured the wiring harness a little better and wouldn't you know it, was able to complete auto calibration multiple times.

Wiggled the wiring while tapping the bottom and can see that it does in fact seem to be a crimp issue. Just happened to be in the right spot every time I checked it that and the fact that it failed on the exact spot led me to believe it might be something else. Going to re-crimp everything and see what happens. Will update when that is complete.

Thanks!!

@dc42 No worries, I know it is too old. For now I have a new board installed and it is working good. I will mess with the other one when I have some free time. Thanks for all the assistance on this.

@dc42 I purchased the board from Fliastruder way back in Dec 2020.

@dc42 Appoligies for the delayed response. I get the same results. I am good with running the nerw board on the Delta.

@dc42 Ok reconnested the board. With the sensor disconnected H reports -6. Jumpering the connector on the effector and running the l999 says correction is 1.

With the resistor in place upon booting it shows -20.5C. If I manually set H to -127 I still show -15.3C.

@dc42 Yes, tried it several times, nothing helped for either sensor. Will have to revist it antoher day, I already have the printer put back together.

@dc42 I am in SBC mode so nothing changed between the configurations. It is possible there is just something wrong with the older board.

@dc42 That made no difference. The current Duet Mini 5+ was a rev0.5, which was working fine with the e3d thermistor. I have a new Mini that I just ordered for a different project, so I swapped them out and it is working just fine now. Makes me question if the old Mini is broken and it has not worked right for a while.

@dc42 I tested both PT1000 on the effect and directly on the board. They both show the same issue. Everything works fine with an e3d thermister, have had this printer for years. When I get a mintue I might try and plug them into my 6HC on my CoreXY and see what it shows. Kind of at a loss.

@Phaedrux Yes I changed the config to suit. I get the same results with the spare PT1000.
@dc42 Pictures attahced.

@Phaedrux I have two of them and they are both pt1000's, very hard to read but it is stamped on the part. Tried both plugged directly into the Duet with the same results.

@dc42 Measured the resistance at the connector going into the Duet and my spare PT100, at room temp they are reading about 1.1k ohms, which is about what I expect.