6 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 has lost the ability to read its own water temperature correctly, so it has shut down to prevent overheating.
Your boiler has detected an issue with water circulation, meaning it cannot properly move hot water through your system and has safely shut down to prevent overheating.
Your boiler has temporarily stopped working because the internal water pressure has dropped too low and needs to be topped up.
Your boiler has detected a potential blockage in the exhaust flue or a problem with the internal fan that removes dangerous gases safely.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Your boiler has tried to start up but failed to ignite the gas burner, so it has safely shut down to prevent any issues.
BoilerFaultCodes