Created my schematic with 4.07 and now i’m on 5.0. ERC does not show an error, is there a workaround or is this a bug ?
Have you read this FAQ?
ERC does not seem to be able to handle detecting unconnected labels of any type (power symbols, global and hierarchical labels are not detected. My guess would be that local labels also suffer from the same problem.)
For power symbols the discussion can be found here: ERC check misses unconnected 5V and 0V
For hierarchical pins the bug report is: https://bugs.launchpad.net/kicad/+bug/1781725
For power symbols it is: https://bugs.launchpad.net/kicad/+bug/1639400
There are some connection failures.
For example, SDA and SCL labels are not connected to the wire. See the little square between the flag and the wire.
When a wire is connected rightly the square vanishes.
@ard knows that 
The question asked is: “why ERC does not flag them?” That is the whole point of this thread.
I got cheated by the error type 3 of the window of the right.
correct, i was only wondering why the unconnected SDL and SCA were not detected by ERC
As i wrote above: this is a known shortcoming for how ERC is implemented. add your voice to the bugreports linked above if you want to help getting this done.
will do that, thanks
I’ve seen similar issue on no-connect symbols also…
the connection to symbol was made properly if i put one random no-connect symbol somewhere & then do a ctrl+z…
observed this on RC2 on ubuntu 16.04… haven’t checked on current stable release, as I’ve not updated yet…
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