While you wait for answers, we may have found some information which could help you.
Click here for Siemens Boiler Heating
I cannot locate my Siemens receiver?
my rdh10rf siemans thermostat will not send signal to my boiler. ?
Have I got got a faulty programmer?
How do i stop the time from flashing on the Siemens RDJ100RF?
Room thermostat?
Thermostat issues- Siemens RDH10RF?