STX 165 :: Why is the snowflake always flashing? Nov 28, 2014 | Why is the snowflake always flashing? 1 Comment admin on November 28, 2014 at 6:25 pm It is preset at factory to be on. It reminds you there is a optional OAT probe that will display temperature (Sandia STP 78 part number 305561-91). If you need to turn off the snow flake please refer to section 3.9 in the installation manual (Installation Configuration).