While you wait for answers, we may have found some information which could help you.
Click here for Temperature Control DaySiemens brtrf keep LOSING connection?
I cannot locate my Siemens receiver?
Siemens RDJ10RF thermostat problem?
my rdh10rf siemans thermostat will not send signal to my boiler. ?
How to use Siemens RWB7 central heating controller?
siemens rwb9 connections to boiler?