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