We may have found other answers which could help you.
Click here for Boiler Central Heating Siemensmy rdh10rf siemans thermostat will not send signal to my boiler. ?
I cannot locate my Siemens receiver?
siemens rwb9 connections to boiler?
How to use Siemens RWB7 central heating controller?
Room thermostat?
Rdh10 & RCR10/443-GB by seimens?