While you wait for answers, we may have found some information which could help you.
Click here for Radiators Heating Bleed
Worcester boiler dripping water?
Oil fired boiler thermostat?
How do i stop the time from flashing on the Siemens RDJ100RF?
Siemens RDJ10RF thermostat problem?
Greenstar 24Ri boiler, fast flashing - can I reset?
Vaillant ecotec 831 plus?