unfrequently "Temp sensor bed" error at Ultimaker II extended

[soul4u 0]

Hi, since changing the heat bed to the newer version -the old one had a wire broken next to the glas - the ultimaker 2 extended is always starting with a heat bed error ...resistance is measured and fine.

What is really strange, is the hard cracking noise, thats coming together with the error message. Please turn sound on for the video.

After turning off and on  in most cases it works fine.

 

Any idea??

Edited May 1, 2017 by Guest

[gr5 2,170]

Well that error happens when there is a short or open (open in this case) between the temp sensor mounted on the bed and the controller board. 98% likely the problem is right where the cables meet the bed. You might even be able to see the loose wire looking down from above at the back of the bed where the cable attaches.

There are 4 wires. You only need to pay attention to the thinner 2 wires. Give a gentle tug to see if they are in there. They might just need reinserting and tightening down with jeweler screwdriver. Or it could be that the connector is not connected to the circuit board anymore (the circuit board is hidden inside the bed and all is much more obvious if you remove the 3 leveling screws and take it all apart.

Sometimes one needs to reheat the solder under that connector block.

It could also be anywhere along the wire but usually wires fail at either end. Not in the middle.