While you wait for answers, we may have found some information which could help you.
Click here for Thermostat Heating SiemensSiemens brtrf keep LOSING connection?
red flashing button siemens RCRIO/433?
Siemens RDJ10RF thermostat problem?
Have I got got a faulty programmer?
How to use Siemens RWB7 central heating controller?
Room thermostat?