Scene and trigger for monitoring temperature

I have a module rfxtrx that can read sensors from Oregon I also have a zwave switch an158 Now I want when the temperature is above 30 degrees the switch an 158 turns on. So a scene made​​:
name: temp switch then immediately then an158 on, then to trigger than Oregon temp module then temp goes above, fill in 30.0 confirm changes. Save.
Started but only the swich goes on, no matter whether the temperature is now 20 or 40 but nothing happens. What am I doing wrong.