22 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: EcoBlue Advance Combi
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 stopped working because the internal fan, which safely exhausts fumes, is not spinning at the correct speed or has electrical trouble.
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Your boiler tried to light the gas but failed, so it has locked itself out for safety.
Your boiler has failed to light or maintain a flame, meaning it cannot heat your water or radiators for safety reasons.
Your boiler has likely overheated, causing a safety sensor to automatically shut the system down to prevent damage.
Your boiler has stopped working because it cannot safely clear away waste gases through the exhaust pipe.
Your boiler has detected that water is either not moving through the system properly or there is not enough pressure for it to operate safely.
Your boiler is having trouble measuring the temperature of your hot water, which usually means your taps will only run cold.
Your boiler's internal thermometer for the heating system has stopped working correctly, meaning the boiler can no longer tell how hot the water is.
Your boiler has detected a problem with how it is venting waste gases or taking in fresh air, causing it to shut down for safety.
Your boiler has stopped working because it cannot light the gas burner or keep the flame burning safely.
Your boiler has too much water inside, which has triggered a safety valve to release the extra pressure to prevent damage.
Your boiler has failed to light or cannot detect that a flame has started, meaning your heating and hot water will not work.
Your boiler has shut down because it has reached a temperature that is too high, often caused by a blockage or a pump failure.
Your boiler has stopped working because it cannot safely clear away waste gases, likely due to a problem with the internal fan or the external flue pipe.
Your boiler has detected that the water pressure is too low or the pump isn't circulating water correctly, causing the system to shut down for safety.
Your boiler is struggling to accurately measure the temperature of your hot water, which usually means your taps will only run cold or or at a very inconsistent temperature.
Your boiler has detected a problem with the internal thermometer that monitors your radiators, causing the system to stop working to avoid overheating.
Your boiler has stopped working because the water pressure is too low or the pump that moves water around your radiators has failed.
Your boiler has shut down because it has detected it is getting too hot, usually due to a lack of water flow or a circulation blockage.
Your boiler has detected a problem with the internal part that measures the temperature of the water for your radiators, meaning your heating likely won't work.
Your boiler has detected a problem with the sensor that monitors hot water temperature, which means you may have inconsistent or no hot water.
BoilerFaultCodes