37 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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Your boiler has detected that parts inside the unit are becoming dangerously hot and has shut itself down to prevent damage.
Your boiler is trying to start up, but it cannot detect a flame to keep it burning.
Your boiler has detected that the exhaust gases leaving via the flue are becoming dangerously hot, so it has safely shut itself down to prevent damage.
Your boiler's main control computer is experiencing an internal error and cannot operate safely, meaning your heating and hot water will not work until it is reset or repaired.
Your boiler's main internal computer is failing to communicate properly, which has caused the system to shut down for safety precautions.
The internal computer that controls your boiler has detected a critical hardware failure and is unable to operate safely, causing the system to shut down.
Your boiler's fan, which is responsible for safely pushing exhaust fumes outside, has failed to start or is performing incorrectly, causing the system to stop working for your safety.
Your boiler has failed to light because it cannot detect a flame after multiple attempts, meaning you currently have no heating or hot water.
Your boiler has temporarily stopped working because it cannot circulate water through the system properly, usually due to low water pressure.
Your boiler is trying to start up, but it cannot detect a flame to keep it running safely.
Your boiler has detected that the internal pipes are getting too cold, so it has automatically turned on its circulation pump to keep the water moving and prevent potential freezing.
Your boiler has detected that the water temperature is too low and has activated its built-in protection to prevent your pipes from freezing.
Your boiler has detected that water is not flowing properly around your heating system, so it has safely shut down to prevent overheating.
Your boiler has detected that the water pressure inside your heating system is too low to operate safely.
Your boiler is failing to detect water moving through the system, which is preventing it from heating up.
Your boiler is unable to read the water flow correctly because of an electrical fault with an internal sensor, which means it has shut itself down to prevent any damage.
Your boiler is currently unable to read the water temperature properly because a wire or sensor that monitors the system has disconnected or failed.
Your boiler's temperature-sensing system is experiencing an electrical fault, causing it to misread the water temperature and shut down for safety.
Your boiler is struggling to read the outdoor temperature correctly because the cable connected to the external weather sensor is likely damaged or loose.
Your boiler is receiving an unusual signal from the weather sensor mounted outside your home, likely due to a loose wire or a damaged cable.
Your boiler is struggling to keep the flame attached to the burner correctly, which causes it to shut down to prevent unsafe operation.
Your boiler has detected a flame inside when it should be turned off, which indicates a potential safety issue with the internal gas control system.
Your boiler is struggling to clear exhaust gases properly, so it has safely shut itself down to prevent any unsafe buildup.
Your boiler is struggling to push air through its internal system effectively, which prevents it from igniting safely.
Your boiler has lost the connection to the temperature sensor in your hot water tank, meaning it cannot accurately monitor your water's heat levels.
Your boiler has lost the ability to read the temperature of your hot water storage tank due to a faulty electrical connection or sensor.
Your boiler is struggling to communicate with the hot water storage tank, which means it may not be able to provide consistent hot water or heating.
Your boiler is struggling to connect with its wall-mounted temperature control unit, causing it to lose track of how warm your home is.
Your boiler is struggling to read the temperature of the room correctly because its connection to the thermostat or temperature sensor has developed a wiring fault.
Your boiler has stopped communicating with your underfloor heating controls, meaning the heating system is currently unable to turn on or regulate the temperature properly.
Your boiler has lost its connection to a safety sensor that monitors the exhaust fumes, causing it to shut down to prevent unsafe operation.
Your boiler has detected a faulty connection in the system that monitors the gas exhaust, so it has shut down to ensure your safety.
Your boiler has detected that the exhaust gases leaving your home are becoming dangerously hot, so it has automatically shut itself down to prevent overheating.
Your boiler's electronic brain is failing to talk to its internal controls, meaning it has safely shut down until the connection is restored.
Your boiler has entered a temporary safety lockout because the reset button has been pushed too many times in a short period.
Your boiler has temporarily stopped working because the water pressure inside the system has dropped too low.
Your boiler is trying to start up, but it is failing to detect a flame so it shuts itself down for safety.
BoilerFaultCodes