I have a z-wave sensor connected via Universal Devices ISY integration. The sensor provides both temperature and humidity values. The sensor entity shows up but the value is “unknown”. The attributes show both values but I can’t figure how to display the values in a dashboard. 
Any help would be greatly appreciated!
I have the same tempature sensor and that is not normal. Your best bet to fix it is to reinterview the device to see if that fixes it. If that doesn’t work you will have to exclude and reinclude the device.