While you wait for answers, we may have found some information which could help you.
Success
Message
Siemens RDJ10RF thermostat problem?
Boiler cycle?
One radiator in a bedroom is always cold?
Remove cover off gas boiler?
How to fix my fireplace?
How do i stop the time from flashing on the Siemens RDJ100RF?
Worcester boiler dripping water?
Oil fired boiler thermostat?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Greenstar 24Ri boiler, fast flashing - can I reset?
Vaillant ecotec 831 plus?
Remove boiler cover?