I’ve got this exact same issue - was working fine at the beginning of the week last week, but on Friday the Runn sensor was completely dead. No lights, nothing. No response when holding down the button on a long press (with power in and power out).
Not picked up by the Configurez app either.
Not very happy about it as it is only about 2 months old
You could try opening it up and disconnecting the battery for a few minutes. I had to do this with mine to fix some other issues it was having, this was recommended by their support team as a way to fully reset the device.
It worked for me, although that being said my Runn is sitting in a drawer as I found it too unreliable.
I’m battling this issue also. No lights and not switching on. Been through all the Troubleshooting steps mentioned in this thread to no avail. NPE doesn’t want to know as I bought it with Zwift (third party).
Update : Just received an email from NPE and they are shipping out a replacement. Happy Chappy
It’s great to hear they looked after you. I’ve never encountered any problems with my Runn, and I’ve always considered them a reputable company!
By the way, ever since I received a tip when I first got my Runn years ago (5 years actually), it’s been continuously connected to a power source, and the battery hasn’t died yet… so far!