if you are having problems with your siemens rdj1orf , then try this it works for us . gently tap the little box with the green and orange light and your central heating will work straight away . we found this solution by accident after resetting the system at least 4 times with no joy , then we gently tapped it out of frustration and amazingly it just started up , the wires all seem to be correctly fitted but it continues to let us down when it feels like it , the solution above works every time , not ideal i know but its the only way to getting heating , the frustrating part it that the system is only 3 years old
GRAHAM TRAVES LINCOLNSHIRE, March 2013