Hi
I assume this is the basic single zone thermostat setup and there is an RFG100 gateway involved, I had this setup in a previous house. You can alter the Min, Max, and Off temperature settings in the installation menu on the thermostat. I can't remember exactly how they relate to the Economy/Away/Off quick actions, but I'm fairly sure you can achieve what you want. Probably change the Off temperature to 10 deg. Its in the installation manual <here>
Hope this helps.