Yahoo weather binding sometimes changes the correct value of temperature, pressure and humidity to UNDEF.
Have you the same problem? Thanks for your help
Hello
I have the same problem
Klaus
Same here
I hope someone can help us to solve this problem. I also tried to change the refresh time from 60 seconds to 15 minutes but the UNDEF values are still there. Please help us 
Do you have persistence on these items with restoreOnStartup? Are you doing anything else at this time, in particular editing .item files?
@rlkoshak: I don’t think this is related to persistence. I saw this behavior also on a VERY frequent basis with my own installation. And to make it clear: We are talking about the dedicated yahoo weather binding, not the general 1.x weather binding.
The state switched from a value to UNDEF very often (and back to a value some cycles later). This was very annoying and the reason why I uninstalled the yahoo binding.
Haven’t tried the 1.x weather binding yet (I have used it on my OH1 installation) and maybe I’ll wait for the general 2.x weather binding.
@lorenzo81: You can file an issue for this on the issue tracker. This should be the right place:
@jaydee73 Second that. I have no persistence Service at all. So its certainly unrelated to persistance.
I third that, I’ve never had the yahoo binding work for the whole week I’ve been using openhab, he he. But the 1.x weather binding works great with Forecast/IO (Dark Sky) and Weather Underground. You just need to unlearn everything you’ve learned for openhab 2 items syntax, he he.
I had a similar problem with the binding switching between UNDEF and valid values permanently. This problem has been fixed: https://github.com/eclipse/smarthome/issues/2778
This fix should be contained in the OH2 Release Candidate.
I think it is definitely a problem of the Yahoo service. Now I’m using wunderground with the http binding and I can say it works very well