20 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Capriz2
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 the temperature of the water being sent to your radiators, so it has purposefully shut down to prevent overheating.
Your boiler is struggling to detect the outside temperature, so it is defaulting to a basic setting to keep your home warm.
Your boiler is failing to detect the airflow required for safe combustion, which is preventing it from starting up properly.
Your boiler has failed to light the flame properly and has safely shut itself down to prevent a build-up of gas.
Your boiler is struggling to detect the temperature of your hot water, which may cause your taps to run cold or prevent the hot water from switching on reliably.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Your boiler has detected that it is running too hot and has automatically switched itself off to prevent internal damage.
Your boiler is struggling to accurately read its own temperature, so it has shut down your heating to prevent any potential overheating.
Your boiler has detected a faulty sensor responsible for hot water temperature, so it is now running in a restricted 'backup' mode to ensure you still have hot water available.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Your boiler is trying to start up but cannot light the gas flame needed to produce heat.
Your boiler has lost the ability to accurately measure the water temperature, so it has safely shut down to prevent overheating.
Your boiler is struggling to accurately detect the temperature of your hot water, which means it will likely stop producing hot water until the faulty sensor is replaced.
Your boiler has detected that it is getting too hot and has automatically shut down to prevent damage or fire hazards.
Your boiler is struggling to clear exhaust gases safely, so it has shut down to prevent any risk of fumes entering your home.
Your boiler is struggling to read the outdoor temperature correctly, which may cause your heating to run less efficiently or not start at all.
Your boiler has stopped working as a safety precaution because it either failed to light or became too hot.
Your boiler has switched itself off because the water level inside the heating system has dropped too low to operate safely.
Your boiler has detected that it is getting dangerously hot and has automatically shut itself down to prevent damage.
Your boiler has stopped working because there is not enough water inside the system to operate safely.
BoilerFaultCodes