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