I just upgraded to OpenHab 2.3.
Now I get this error in the tail log:
2018-06-08 00:16:04.616 [WARN ] [ui.internal.items.ItemUIRegistryImpl] - Exception while formatting value '18' of item NetamoUdendRsModule_Temperature with format '%.1f %unit%': Conversion = 'u'
2018-06-08 00:16:04.634 [WARN ] [ui.internal.items.ItemUIRegistryImpl] - Exception while formatting value '25.3999996185302734375' of item NetamoIndendRsHjemme_Temperature with format '%.1f %unit%': Conversion = 'u'
I remeber reading something about formatting had some changes in openhab 2.3. But I can´t seem to find the thread.