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