48 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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Your boiler is working correctly and is simply waiting for a command from your thermostat to start heating.
Your boiler is busy clearing out any leftover gases before it tries to ignite again.
Your boiler is currently attempting to start up and light the flame to provide heating or hot water.
Your boiler is simply notifying you that it is currently busy heating your tap water and there is no actual fault.
Your boiler is continuing to run its internal pump after you have finished using hot water, which is often caused by a stuck internal valve or a sensor error.
Your boiler has detected a problem with its internal temperature sensors, meaning it cannot accurately monitor the water temperature and has shut down as a safety precaution.
Your boiler has detected a problem with its internal temperature sensors, meaning it cannot accurately monitor the water temperature and has shut down as a safety precaution.
Your boiler is struggling to ignite or detect a flame, causing the system to stop as a safety precaution.
Your boiler has shut down because its internal temperature got too hot, likely due to a circulation problem or a blockage.
Your boiler has detected that the water inside is getting too hot too quickly, usually because there isn't enough water pressure or the water isn't moving through the pipes properly.
Your boiler is struggling to ignite or detect a flame at the beginning of its start-up process.
Your boiler has shut down because the water inside has become far too hot, which is often caused by a blockage or a pump that isn't moving water around the system properly.
Your boiler has detected that water is not circulating correctly, often because there is trapped air or the system pressure is too low.
Your boiler has detected an electrical connection issue or an internal fault in its main control computer, causing it to stop working for safety.
Your boiler has shut down because the internal gases have become too hot, which is a safety measure to prevent damage to the system.
Your boiler has tried to light several times but cannot establish a flame, meaning you will have no heating or hot water.
Your boiler is failing to light the gas burner properly and has locked itself out for safety after several unsuccessful tries.
Your boiler is failing to light the gas or keep the flame burning, leading to a safety lockout.
Your boiler was working but the flame has unexpectedly gone out, meaning the system has stopped providing heat for your safety.
Your boiler detects a flame when there shouldn't be one, which is a safety mechanism that prevents the unit from firing up.
Your boiler's internal computer has encountered a critical communication error and can no longer safely operate the heating system.
Your boiler is struggling to ignite or detect a flame correctly during its starting sequence and has paused for safety.
Your boiler has detected a problem with the sensor that monitors the temperature of the water leaving the unit, causing it to shut down to prevent overheating.
Your boiler has detected an issue with the air fan, preventing it from starting safely or clearing exhaust fumes correctly.
Your boiler has stopped working because it cannot correctly read the temperature of the water returning to the unit.
Your boiler’s main computer brain has encountered a serious internal error and has stopped working to protect the system.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Your boiler's computer brain has encountered an internal error and can no longer control the heating system safely.
Your boiler's computer brain has developed a software or hardware glitch and can no longer communicate with the rest of the system.
Your boiler's internal computer has encountered a communication or hardware malfunction and cannot operate safely.
Your boiler's main internal computer has developed a communication fault or an electronic failure, preventing the system from operating safely.
Your boiler's internal computer brain has developed a communication fault and cannot operate properly.
Your boiler's internal computer brain has developed a communication fault and can no longer process instructions safely.
Your boiler's computer brain has encountered a communication error or internal failure and cannot safely operate.
Your boiler has detected a problem with the sensor that measures hot water temperature, which often means your hot water may be cold or inconsistent.
Your boiler's external temperature sensor is sending an incorrect signal, which usually means the system cannot adjust its heating based on the weather outside.
Your boiler's fan is not spinning at the correct speed, which means it cannot safely clear waste gases or bring in fresh air to stay lit.
Your boiler's internal computer has detected a problem with how it manages the flame, causing it to shut down for safety.
Your boiler's main internal computer has developed a communication or electronic fault, causing the system to stop working for safety.
Your boiler's computer parts are having trouble talking to each other, which means the system cannot operate or provide heating and hot water.
Your boiler's main internal computer has lost touch with the front display screen, meaning they can no longer talk to each other to operate the heating.
Your boiler has shut down because a safety sensor has detected that it is getting too hot or that there is an issue with the gas supply pressure.
Your boiler's computer brain has encountered an internal software or hardware communication failure, causing the system to shut down for safety.
Your boiler's internal computer has encountered a critical communication error and cannot process commands to heat your home.
Your boiler's main internal computer has developed a communication fault or electronic failure, preventing it from managing the heating system.
Your boiler's computer memory has encountered a configuration error where internal settings have fallen outside of their safe operating ranges.
Your boiler's internal computer has detected an error in its configuration settings and needs a professional to reset internal parameters.
Your boiler's internal computer has suffered a software failure and can no longer process the settings needed to operate safely.
BoilerFaultCodes