We may have found other answers which could help you.
Click here for Fault Solid Light
siemens rwb9 connections to boiler?
How to use Siemens RWB7 central heating controller?
Thermostat issues- Siemens RDH10RF?
Have I got got a faulty programmer?
Siemens brtrf keep LOSING connection?
Siemens RDJ10RF thermostat problem?