7 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
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Your boiler's control panel is not receiving a signal, which is preventing it from firing up to provide your heating and hot water.
Your boiler is effectively taking a short, scheduled rest to prevent it from overheating while it regulates the water temperature.
Your boiler has stopped working because it cannot clear stale air and bring in fresh air needed for safe operation.
Your boiler has stopped working because it couldn't light the flame, so it has safely shut itself down to prevent gas from building up.
Your boiler has stopped working because it failed to light the flame, which means you currently have no heating or hot water.
Your boiler has detected that it is dangerously overheated or has run without enough water and will not restart until it has cooled down completely.
Your boiler has lost all power and is completely shut down, meaning it cannot provide any heating or hot water.
BoilerFaultCodes