We may have found other answers which could help you.
Click here for Combi Overheating Central Heating
Vaillant ecotec 831 plus?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Remove boiler cover?
Greenstar 24Ri boiler, fast flashing - can I reset?
Siemens RDJ10RF thermostat problem?
Boiler cycle?