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I am having trouble figuring out what is wrong with these nets? "Design -> Netlist -> Clear all nets" will delete only the functional ones and these unconnected ones remain. Can anyone tell me what happened and how to fix this? Thank you. enter image description here

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  • \$\begingroup\$ Route them and then re-run the DRC. \$\endgroup\$
    – DerStrom8
    Commented Jun 9, 2019 at 10:43
  • \$\begingroup\$ Which Altium version you are using? \$\endgroup\$
    – mastermind
    Commented Mar 31, 2021 at 21:10

3 Answers 3

Reset to default
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As these traces are not assigned to any net, they are not deleted by "Design -> Netlist -> Clear all nets". There are two possibilities to do so:

  1. Use "Route » Un-Route » All", which clears all physical connections on your PCB (https://www.altium.com/documentation/17.0/display/ADES/PCB_Cmd-UnRoute((UnRoute))_AD)

  2. Right click a trace -> find similar objects and select the layer and switch to "Same". This selects all tracks on the specified layer and you can easily delete them

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Go to the board then click on Tools >> Reset Error Markers will solve you problem.

Remove altium DRC error markers

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Unroute has no effect. These are considered errors. From the Tools -> Menu -> Reset Error Markers will remove all these ones

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