While you wait for answers, we may have found some information which could help you.
Success
Message
Remove cover off gas boiler?
Boiler cycle?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Remove boiler cover?
Vaillant F22 fault?
Siemens RDJ10RF thermostat problem?
Oil fired boiler thermostat?
Vaillant ecotec 831 plus?
Worcester boiler dripping water?
How to fix my fireplace?
How do i stop the time from flashing on the Siemens RDJ100RF?
Greenstar 24Ri boiler, fast flashing - can I reset?