PT1000 random deviations

[stienfromarden]

I am currently printing a chair, with a triple heat zone pellet extruder, all diy and controlled by a duet wifi2.

While starting up today, I noticed heat zone 3 was 12 degrees c off from the rest (1 & 2 where at 18c and the last heater was at 30, while heaters are not on and at room temp...)

I was in a hurry and thought let's see what happens and started the print... now I get some weird spikes at this particular heater... I had some loose cables before on another pt1000 and I know how that looks like (jumping from 0 to 2000c all the time) these deviations are different.. I have been using these pt1000 for over a year and I don't know what going on..

I have no clue where this can come from all of a sudden, anybody here experienced the same issue? See printscreen for clarification:

• Stijn

[Phaedrux]

Do you have a spare PT1000 to swap with?

Can you swap the PT1000 wiring at the Duet plugs and see if the deviations follow the sensor or stay with the port?

[stienfromarden]

so... i was going to swap the pt1000 wiring and touched the connector and suddenly it popped back to around the same temp as the rest... guess it was still a sort of loose wire...

thanks anyway