72 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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Your boiler is trying to start but cannot light the internal flame, so it has shut down as a safety precaution.
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 are becoming dangerously hot, so it has automatically shut down to prevent damage or overheating.
Your boiler is struggling to detect the connection to the part that controls its gas supply, which prevents it from safely igniting.
Your boiler is struggling to accurately measure the temperature of the water circulating through your radiators, which has caused it to stop working for your safety.
Your boiler is having trouble measuring the temperature of the hot water, which means it likely cannot provide a steady supply of hot water to your taps.
Your boiler has been manually restarted too many times, so it has locked itself out to prevent further issues.
Your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.
Your boiler's computer is confused because it has detected a mismatch between its internal settings and how the plumbing is actually set up.
Your boiler's computer has become confused and is struggling to recognise the system setup, which prevents it from firing up correctly.
Your boiler has stopped working because it cannot properly circulate the air it needs to run safely.
Your boiler is confused because it thinks it senses a flame when it shouldn't, or it can't correctly detect the flame it's working to produce.
Your boiler's computer is confused because it has detected a mismatch between its internal settings and how the plumbing is actually set up.
Your boiler has detected that one of the buttons on its control panel is permanently pressed down, preventing it from functioning correctly.
Your boiler has shut down because it senses that water is heating up far too quickly, which usually happens due to circulation issues.
Your boiler is struggling to pump water around your heating system, causing the water inside to heat up too quickly and triggering a safety shutdown.
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 digital connection to your room thermostat, meaning it no longer knows when to turn your heating on or off.
Your boiler's electronic control system is showing an error for a feature that isn't actually installed on your unit, which suggests a computer software glitch or a loose internal communication wire.
Your boiler is failing to start because it is not receiving enough consistent electricity from your home's power supply.
Your boiler is struggling to keep the flame lit and is automatically trying to restart itself to get your heating or hot water working again.
Your boiler is struggling to keep its internal flame lit and has safely shut down to prevent gas from building up.
Your boiler is struggling because the water is not circulating properly between the heater and your radiators, causing a temperature difference that is too large.
Your boiler has detected that a safety device or connection is missing or has been triggered, causing it to stop operating as a precaution.
Your boiler has detected that the exhaust gases are getting too hot and has automatically lowered its power to prevent overheating and potential damage.
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 it is sensing an unstable or incorrect electrical power supply from your home's mains.
Your boiler has detected that the water pump inside is not spinning correctly, which stops heat from being moved around your home.
Your boiler is struggling to push water around your heating system because there is trapped air inside the internal pump, which is preventing your radiators from warming up properly.
Your boiler has lost its internal settings, likely after a repair or power reset, and needs a professional to recalibrate it to burn gas safely and efficiently.
Your boiler’s internal computer has detected a change in its settings and needs to be manually recalibrated by a professional to ensure it runs safely and efficiently.
Your boiler has detected an inconsistent temperature reading between two of its internal safety sensors, causing it to shut down to prevent overheating.
Your boiler has detected a communication error with its internal temperature monitoring system and has automatically shut down to ensure your safety.
Your boiler has detected an internal issue with the component that regulates your gas supply, meaning it has safely shut down to prevent improper operation.
Your boiler has detected an issue with the internal component that manages the flow of gas, causing it to shut down for safety reasons.
Your boiler has detected an internal communication problem with the part that controls the gas supply, meaning it is unable to safely light the flame to heat your home.
Your boiler is struggling to get enough gas to run properly, so it has purposefully locked itself into a lower power setting to remain safe.
Your boiler has detected a problem with the internal safety controls that manage the fuel supply, so it has safely shut itself down to prevent operation.
Your boiler is struggling to keep a steady flame, causing it to shut down for safety reasons.
Your boiler has detected an issue with the flame intensity that it cannot regulate, causing it to shut down for safety.
Your boiler is failing to stay lit because it cannot detect a flame, meaning you are currently without heating or hot water.
Your boiler is struggling to breathe properly and has hit the limit on how much it can adjust its internal air supply to stay running safely.
Your boiler has detected an issue with the flame intensity that falls outside of its normal operating parameters, causing it to shut down for safety.
Your boiler has detected an issue with the way it is burning fuel and has shut down to ensure your safety.
Your boiler is struggling to keep a steady flame, causing it to turn itself off and on repeatedly to maintain safety.
Your boiler is struggling to breathe because the exhaust pipe that vents fumes outside is blocked or obstructed.
Your boiler's computer has encountered too many internal processing errors and has safely locked itself to prevent further instability.
Your boiler is receiving an incorrect signal from an optional external weather sensor, which means it cannot accurately adjust its temperature based on outdoor conditions.
Your boiler is failing to light the internal flame, which means it cannot produce any heat or hot water.
Your boiler has switched itself off because it has detected an internal temperature that is too high, likely due to a flow problem or a blockage.
Your boiler has detected that the exhaust gases are getting too hot and has automatically shut down to prevent damage or safety hazards.
Your boiler has detected an electrical issue with the flame sensor, meaning it cannot reliably confirm if the burners are ignited.
Your boiler has lost the ability to accurately measure the temperature of the water circulating through your radiators, so it has safely shut down to prevent overheating.
Your boiler is currently unable to sense the temperature of your hot water, which means it has stopped providing hot water to your taps and shower.
Your boiler has blocked itself because it has been reset or restarted too many times due to an unresolved underlying fault.
Your boiler has stopped because the water pressure inside your heating system has dropped too low to operate safely.
Your boiler is unable to read the temperature of the water returning from your radiators, so it has shut down to prevent overheating.
Your boiler has detected that the internal fan responsible for safely removing exhaust gases is not spinning correctly, so it has shut down to prevent any danger.
Your boiler has detected a flame inside when it should be switched off, which prevents it from operating safely.
Your boiler's electronic control panel is not responding properly, which prevents it from starting or maintaining its heating functions.
Your boiler has lost its connection with the thermostat or room controller, meaning it does not know when to turn the heating on or off.
Your boiler has detected that the electrical power supply coming from your wall socket or fused spur is unstable or too low to operate safely.
Your boiler has detected that the flame inside has gone out unexpectedly, so it has shut itself down to keep your home safe.
Your boiler is repeatedly failing to keep its internal flame lit, which means it cannot heat your water or home reliably.
Your boiler's software currently does not recognise the type of gas being supplied to it and requires a specialist adjustment to ensure it is burning fuel safely.
Your boiler has lost its internal configuration settings and needs to carry out a specific self-adjustment process to ensure it burns gas safely and efficiently.
Your boiler is having trouble managing the flow of gas needed to create a flame, so it has stopped working for your safety.
Your boiler is currently in a manual testing mode used by engineers to check system performance, rather than indicating a genuine breakdown.
Your boiler's internal settings have been configured incorrectly to account for a flue or exhaust pipe that is longer than the standard installation length.
Your boiler has detected that it is running too hot and has automatically switched itself off to prevent any damage or safety issues.
Your boiler is failing to keep its small starter flame lit, which prevents the main heating system from switching on safely.
Your boiler has failed to ignite or lost its flame, so it has purposefully shut down to prevent gas from escaping.
BoilerFaultCodes