Sorry no answer for you but I also have a problem with my Drayton RF2. The transmitter display is showing a constant 19 or 20 degrees, even when I stick it in the fridge! I can adjust the set temperatures to above 20 degrees so that the heating comes on at the desired times but this is not an ideal situation. Has anyone else had this problem and know of a possible fix, although it is likely that it is a sensor/circuit board problem.
Dave, Edinburgh, October 2009