While you wait for answers, we may have found some information which could help you.
Click here for Heating Controller Boiler
Siemens brtrf keep LOSING connection?
How to use Siemens RWB7 central heating controller?
Siemens RDJ10RF thermostat problem?
red flashing button siemens RCRIO/433?
Room thermostat?
my rdh10rf siemans thermostat will not send signal to my boiler. ?