WHat is wrong with this sensor?
Checked your logs?
All my 3 weather service are not working
dark sky, yr, own (own I can’t find in the log, search for OWN gives the known result
17-04-30 13:30:13 WARNING (MainThread) [homeassistant.components.sensor.yr] Retrying in 15 minutes: [Errno -2] Cannot connect to host aa015h6buqvih86i1.api.met.no:443 ssl:True [Name or service not known]
17-04-30 13:30:14 ERROR (Thread-11) [homeassistant.components.sensor.darksky] Unable to connect to Dark Sky. HTTPSConnectionPool(host='api.darksky.net', port=443): Max retries exceeded with url: /forecast/1a6757d6483447329468f758fbfc1c40/xx973358,1xx.616709?units=si (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x6d982cb0>: Failed to establish a new connection: [Errno -2] Name or service not known',))
There you have the answer in the log.
Your HA instance is not able to connect to the yr server.
Is your computer online? What happens if you go to aa015h6buqvih86i1.api.met.no on the computer running HA?
From my PC I can. how to check from a pi3?
I did
curl aa015h6buqvih86i1.api.met.no
pi@hassbian:~ $ curl aa015h6buqvih86i1.api.met.no
curl: (6) Could not resolve host: aa015h6buqvih86i1.api.met.no
So it is something wrong with the internet connection on your pi.
yes had to fix my dns static ip address since now I use pi-hole
sudo nano /etc/dhcpcd.conf