The numeric-display equivalent of an ignition fault — the boiler cannot detect a flame.
Most common on: Greenstar 2000 / 4000 / 8000
227 is shown on newer Greenstar models with a numeric display and means the boiler has failed to detect a flame during ignition. It is the direct equivalent of the older EA letter code.
As with EA, it is a deliberate safety lockout. The boiler will not keep the gas valve open when it cannot confirm the burner has lit.
Check other gas appliances light, the boiler gas cock is open and any prepayment meter has credit.
In freezing weather, thaw the external condensate pipe if it is blocked with ice, then reset.
Hold the reset button. If 227 returns, do not keep resetting — book a Gas Safe engineer.
Work on the gas side of a boiler must be carried out by a Gas Safe registered engineer. The checks above are limited to safe, non-invasive things a homeowner can look at (pressure, resets, the gas supply) — if in doubt, stop and call an engineer.
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The numeric-display equivalent of an ignition fault — the boiler cannot detect a flame. 227 is shown on newer Greenstar models with a numeric display and means the boiler has failed to detect a flame during ignition. It is the direct equivalent of the older EA letter code.
You can try a single reset and the safe checks below, but Worcester Bosch 227 usually needs a Gas Safe registered engineer. Never work on the gas side of a boiler yourself — it is illegal and dangerous unless you are Gas Safe registered.
A recurring 227 means the underlying cause has not been fixed — most often interrupted gas supply or low gas pressure. Resetting repeatedly will not solve it; get the boiler diagnosed properly.
Ignition / flame detection lockout
Pump / circulation fault (dry fire protection)
Fan fault
See all Worcester Bosch fault codes.