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