We may have found other answers which could help you.
Click here for Room Central Heating GoingCan I move the thermostat to another room?
I cannot locate my Siemens receiver?
Siemens rdh10rf thermostat?
Siemens RDJ10RF thermostat problem?
How to use Siemens RWB7 central heating controller?
Thermostat issues- Siemens RDH10RF?