While you wait for answers, we may have found some information which could help you.
Click here for Gas System GoingCan I move the thermostat to another room?
Siemens brtrf keep LOSING connection?
Siemens rdh10rf thermostat?
red flashing button siemens RCRIO/433?
Have I got got a faulty programmer?
Thermostat issues- Siemens RDH10RF?