Toolboard 1LC V1.1 Reading 0 Degrees at Ambient

[Wulfsta]

I'm seeing an issue where a known good pt1000 is reading near 0 on temp0 at ambient. Measuring the resistance across the pins yields 3.038 kOhms. This differs from temp1, where the resistance is 2.764 kOhms. I don't see any visible damage to the board - any advice?

[dc42]

@Wulfsta, if you run M308 S# where #is the sensor number, what is the response? Also, which firmware version are you using on the tool board?

[Wulfsta]

@dc42 As follows:

Sensor 1 (Nozzle) type PT1000 using pin 121.temp0, reading 0.5, last error: success, R:2200.0 L:-14 H:-8

Firmware: RepRapFirmware for Duet 3 MB6HC 3.4.0beta6 (2021-11-06) and Duet TOOL1LC rev 1.1 or later firmware version 3.4.0beta6 (2021-11-06 11:56:11)

This is with the PT1000 plugged. If the L and H values look odd (I have no idea what is normal for these), it's due to trying an auto-calibration.

[T3P3Tony]

@wulfsta what temperature does the sensor read if you plug it into temp1 on the toolboard (and change the config to point at that? if you can test it on the mainbord as well that would be good?

[Wulfsta]

@t3p3tony I get a value of 22.4 Celsius on temp1.

[T3P3Tony]

@wulfsta ok please send an email to warranty@duet3d.com and we will progress this.

[Wulfsta]

@t3p3tony Email sent.

[Wulfsta]

I'm seeing this issue on the replacement board. Prior to the first print it measured the same as ambient, two short prints later (around six hours) the measurement is 11 degrees. Do you have any idea what might cause this? No enclosure during these prints, so it seems unlikely to be heat?

[Wulfsta]

New thread here.