5 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 accurately measure its own internal temperature, which causes it to shut down to prevent the system from getting too hot.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Your boiler is failing to light the flame, which means it cannot produce any heating or hot water for your home.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Your boiler has detected an issue with the ventilation system that clears exhaust gases, so it has safely shut itself down to prevent unsafe operation.
BoilerFaultCodes