Worcester Bosch fault guide
Worcester Bosch EA 227: what it means and what to do
EA 227 means the boiler tried to light but did not detect a flame, so it locked out for safety. It is one of the most common Worcester Bosch codes we are called out to.
Phones answered 7am–8pm, 7 days a week. Gas Safe registered 943380.
Further work and parts are always priced and agreed before we carry on.
What it means
The boiler’s flame sensor did not “see” a flame when it tried to ignite, so it stopped and locked out. You will usually have no heating and no hot water until the fault is cleared.
Common causes
- No gas reaching the boiler (prepayment meter, supply problem)
- Frozen or blocked condensate pipe or trap
- Worn or dirty ignition or flame-sensing electrode
- Faulty gas valve or PCB
- Flue or air-supply problem
Safe checks you can do
- Check your gas supply. Do your hob or gas fire work? If you have a prepayment meter, check it has credit and the emergency credit hasn’t run out.
- In freezing weather, check the white or grey plastic condensate pipe that runs outside to a drain. If it is frozen, pour warm (not boiling) water along it, then reset the boiler.
- Reset the boiler once using the reset button or dial (check your user manual). If the code comes straight back, stop resetting. Repeated resets won’t fix it and can make the fault harder to diagnose.
When to call an engineer
If the checks above don’t clear it, or the fault keeps coming back, the boiler needs a Gas Safe engineer to diagnose it. Our diagnostic visit is £144 including VAT, covering attendance and up to the first hour. We tell you the repair price before doing any further work.
When you call, tell us the boiler make and model, the exact code on the display and what you have already tried.
Other guides
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