Worcester Bosch showing EA or EA 227 in Coventry? It means the boiler tried to light and saw no flame. Safe checks you can do first, and when it needs an engineer.
Try the hob or gas fire. If nothing lights anywhere, the problem is the supply, not the boiler. On a prepayment meter, check it has credit - an empty meter produces exactly this code.
In a cold snap, the white plastic pipe running outside can freeze and block the boiler. Warm (not boiling) water poured along it often clears it; then reset once.
Press reset once. If EA returns straight away, leave it off - repeated attempts on a boiler that cannot light do it no good.
Gas pressure at the valve, the ignition electrode and its lead, the flame sensor, and the flue. Usually a part-level repair rather than a new boiler.
No - the boiler has shut itself down because it could not confirm a flame. Smell gas? Leave the house, do not use switches, and call the National Gas Emergency line on 0800 111 999. A fault code is never a gas leak, but a smell always is.
That points at the condensate pipe freezing. Lagging or re-routing the outside run usually stops it for good.
Ask to see the Gas Safe ID card and check the back - it lists what that person is signed off to work on. Anyone genuine expects to be asked.
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