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