While you wait for answers, we may have found some information which could help you.
Click here for Heating Home Engineer
How to fix my fireplace?
Oil fired boiler thermostat?
Greenstar 24Ri boiler, fast flashing - can I reset?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Vaillant ecotec 831 plus?
Remove boiler cover?