While you wait for answers, we may have found some information which could help you.
Success
Message
How do i stop the time from flashing on the Siemens RDJ100RF?
Siemens brtrf keep LOSING connection?
Siemens RDJ10RF thermostat problem?
siemens rwb9 connections to boiler?
Thermostat not working?
red flashing button siemens RCRIO/433?
Room thermostat?
Have I got got a faulty programmer?
Thermostat issues- Siemens RDH10RF?
Rdh10 & RCR10/443-GB by seimens?
I cannot locate my Siemens receiver?
How to use Siemens RWB7 central heating controller?