67 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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Your boiler is failing to light the burner, which means it cannot produce any heat or hot water.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Your boiler has detected that the exhaust gases leaving your home are becoming dangerously hot and has shut itself down to prevent damage or safety risks.
Your boiler has lost its electrical communication with the gas supply component, meaning it cannot safely ignite to provide heating or hot water.
Your boiler has detected an issue with the sensor that measures the flow of water for your central heating, which is likely preventing the system from heating your home.
Your boiler is struggling to accurately measure the temperature of your hot water, which means it has stopped providing it to prevent system overheating.
Your boiler has attempted to restart itself five times after failing to operate, and has now locked itself out for safety reasons.
Your boiler has stopped working because the water pressure inside your heating system has dropped too low.
Your boiler's computer is confused because its internal settings, such as whether it should be heating water or radiators, do not align with the physical parts installed.
Your boiler's computer is confused because it has detected a mismatch between its internal settings and the actual physical setup of the heating system.
Your boiler has stopped working because it cannot properly clear exhaust gases, meaning it is currently unable to provide heating or hot water.
Your boiler has detected a flame signal when it shouldn't be there, which means it has safely shut down to prevent a potential hazard.
Your boiler's computer is confused because it has detected a mismatch between its internal settings and how the plumbing system is actually set up.
Your boiler's control panel detects that one of the buttons is jammed or held down, which is preventing the system from operating normally.
Your boiler has detected an issue with the sensor that monitors the temperature of the gases leaving your flue, causing it to shut down for safety.
Your boiler has lost its connection to your digital thermostat or programmer, meaning it doesn't know when to turn the heating on.
The boiler's control system is experiencing a communication error, which prevents it from operating correctly.
Your boiler is failing to start because it is not receiving the correct amount of electrical power from your home's mains supply.
Your boiler is struggling to keep its flame lit, which means it will stop providing heating and hot water until the issue is resolved.
Your boiler is struggling to keep its internal flame lit while it is running, likely because it is having trouble breathing due to strong winds or a blockage in its external exhaust pipe.
Your boiler has detected that the water is not circulating efficiently through your heating system, as it is coming back to the boiler much cooler than it left.
Your boiler has stopped working because a safety link or an external safety device, such as a frost thermostat or pipe protection sensor, has been triggered or disconnected.
Your boiler is getting too hot inside the exhaust system and has automatically slowed down to protect itself from overheating.
Your boiler is struggling to talk to your wireless thermostat, which means it doesn't know when to turn your heating on or off.
Your boiler is struggling because the electricity supply it is receiving is unstable or not the standard frequency required.
Your boiler is unable to move the hot water around your system because the device responsible for circulating it has stopped working.
Your boiler is struggling because there is trapped air inside the system, which is preventing water from circulating properly to heat your home.
Your boiler has lost its saved settings and needs a professional recalibration to safely manage the mix of gas and air used for heating.
Your boiler’s internal settings have become scrambled, meaning it has forgotten how to manage its own fuel and air levels correctly.
Your boiler has detected a confusing temperature difference between its internal sensors and has shut down as a precaution to prevent overheating.
Your boiler has detected a communication error with its internal temperature monitoring system, preventing it from operating safely.
Your boiler has detected an issue with the internal components that manage the gas supply, meaning it has safely shut itself down to prevent unsafe operation.
Your boiler has detected an issue with the internal component that controls the gas supply, meaning it has safely shut itself down to prevent any risk.
Your boiler has detected an internal electrical problem that is preventing it from safely opening the gas supply, so it has shut down to protect the system.
Your boiler has detected that it is not receiving enough gas to work properly, so it has lowered its performance to keep itself safe while it runs in a limited emergency mode.
Your boiler has detected a failure in the system that supplies fuel for the flame, so it has safely shut down to prevent any unsafe operation.
Your boiler is struggling to keep a steady flame, causing it to shut down because it cannot safely maintain the fire needed to heat your home.
Your boiler has detected an issue with the quality of the flame and has shut down for safety reasons to prevent incomplete combustion.
Your boiler is trying to start but cannot detect the flame, so it is shutting down for safety reasons to prevent gas buildup.
Your boiler is struggling to push air through safely and has reached its physical limit, causing it to shut down to prevent unsafe operation.
Your boiler has detected an abnormal flame signal, meaning it cannot safely regulate its internal combustion process and has shut down to prevent damage.
Your boiler has detected that it cannot clear gases properly, so it has safely shut itself down to prevent any unsafe build-up.
Your boiler is struggling to keep its flame lit, which is causing it to quickly turn itself off and on again.
Your boiler is struggling to breathe because the pipe that vents exhaust gases outside is blocked or obstructed.
Your boiler's computer system has detected too many internal errors and has shut down for safety reasons.
Your boiler is receiving an unusual signal from an external weather-sensing device linked to a central control system, causing it to pause normal operation.
Your boiler has failed to light the flame needed to produce heat and hot water.
Your boiler has detected that it is getting too hot and has automatically shut down to prevent damage or dangerous overheating.
Your boiler has detected that hot exhaust gases are not escaping properly and has shut itself down as a vital safety precaution.
Your boiler has detected an issue with its internal electrical connections, preventing it from starting up safely.
Your boiler has stopped working because it is unable to accurately measure the temperature of the water circulating through your heating system.
Your boiler is struggling to accurately measure the temperature of the water being heated for your taps and shower.
Your boiler has attempted to restart itself too many times due to an underlying fault, so it has now locked itself to prevent further issues.
Your boiler has stopped working because the water pressure inside your heating system has dropped too low.
Your boiler's temperature sensor is providing incorrect readings, so the system has shut down to prevent it from overheating.
Your boiler has detected that the internal fan responsible for safely removing exhaust gases is not spinning correctly or has lost its electrical connection.
Your boiler has detected a flame when it is not supposed to be lit, which is a safety mechanism preventing it from starting up to protect your home.
Your boiler's electronic control panel is experiencing a communication error, which means it cannot register your settings or operate correctly.
Your boiler has lost its connection to the digital controller or thermostat, meaning it cannot receive instructions on when to turn the heating or hot water on.
Your boiler is struggling because the electrical voltage being supplied to it is lower than it needs to be to operate correctly.
Your boiler has detected that the burner has gone out or failed to ignite, so it has safely shut itself down to prevent gas from building up.
Your boiler is having trouble staying lit and keeps cutting out because it cannot confirm the flame is burning correctly.
Your boiler’s internal computer has flagged that it needs a professional safety recalibration to ensure it is burning gas correctly.
Your boiler's computer needs to reset and recalibrate its internal heating settings to function correctly again.
Your boiler's internal fuel control system is experiencing an electrical issue, meaning it cannot safely regulate the gas supply to produce heat.
Your boiler is currently running in a special testing mode designed for engineers to check flue gases, rather than a system failure.
Your boiler's computer is reporting an issue because the settings do not match the length of the exhaust pipe installed on your property.
BoilerFaultCodes