60 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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Your boiler has detected an ignition failure, meaning it is failing to light the flame required to provide heating and hot water.
Your boiler has detected that it is running too hot and has automatically shut down to prevent damage to its internal parts.
Your boiler is struggling to read its own internal water pressure because the sensor responsible for checking it has a loose connection or a faulty wire.
Your boiler is struggling to move water through the system, likely due to low water pressure or a blockage.
Your boiler has detected that water is not flowing through the system correctly, which is preventing it from heating your home safely.
Your boiler has detected that water is not flowing around your heating system properly, so it has shut down to prevent damage.
Your boiler has detected that water is not moving around your heating system properly, which has caused it to stop working to prevent damage.
Your boiler is struggling to pump water around your heating system effectively, usually due to low pressure or trapped air.
Your boiler has detected that the water pressure inside your heating system is too low to operate safely.
Your boiler has detected that the water pressure inside your heating system is too high and has shut down for safety.
Your boiler has stopped working because one of its internal temperature sensors is malfunctioning and cannot correctly read the heat level.
Your boiler has detected a faulty temperature sensor reading near the main heat exchanger, causing it to shut down to prevent potential damage.
Your boiler is struggling to read the temperature from an outdoor sensor, which may cause your heating to run less efficiently than usual.
Your boiler has detected that the safety connection for an underfloor heating system is disconnected or faulty, causing it to stop heating to prevent damage.
Your boiler has detected an issue with the sensor that measures the temperature of the water circulating inside your heating system.
Your boiler has lost the ability to read the temperature of your hot water supply because a sensor connection has been interrupted or damaged.
Your boiler has lost the connection to the temperature sensor in your solar water heating system, meaning it cannot correctly measure the heat from your solar panels.
Your boiler is struggling to read the temperature of your hot water cylinder because a sensor connection has failed.
Your boiler is having trouble communicating with the solar panel sensor, which may prevent your system from correctly using solar energy to heat your water.
Your boiler is having trouble communicating with an optional solar water heating sensor, which is preventing it from correctly managing your hot water temperatures.
Your solar water heating system is reporting that the fluid inside its collectors has become too hot.
Your boiler has detected that the temperature from your solar thermal panels is lower than expected, likely due to a sensor issue or a lack of sunlight.
Your boiler has detected that the water inside the cylinder or the heating system has reached a dangerously high temperature and has shut itself down to prevent damage.
Your boiler is trying to start, but it cannot sense a steady flame, so it has safely shut itself down to prevent gas from building up.
Your boiler's computer has encountered a memory error, meaning it has forgotten its configuration settings and cannot operate correctly.
Your boiler's internal control components are struggling to talk to each other, which has caused the system to stop working as a safety precaution.
Your boiler's main control computer is failing to communicate properly, which has caused the system to shut down for safety.
Your boiler's internal computer is experiencing a communication error, which has caused the system to shut down for safety.
Your boiler's main control unit has identified an internal software or hardware failure, meaning it has safely shut down to prevent further damage.
Your boiler's central control computer has encountered a serious internal error and cannot communicate with the system to start your heating.
Your boiler has failed to ignite because it cannot detect a steady flow of gas, likely due to air being trapped in the supply line.
Your boiler is struggling to read the temperature because the connection to its internal room thermostat sensor has been interrupted or damaged.
Your boiler has detected very cold temperatures and is running the pump to stop the water inside from freezing.
Your boiler has failed to light because it cannot detect a flame, meaning you currently have no heating or hot water.
Your boiler has detected a flame inside the unit even though it should have shut the gas supply off, which is a significant safety concern.
Your boiler has detected very low temperatures and is automatically activating its internal protection mode to prevent pipes from freezing.
Your boiler has detected a faulty connection in the sensor that monitors the temperature of the exhaust gases leaving the unit, causing it to shut down for safety.
Your boiler has detected that the exhaust gases leaving the unit are becoming dangerously hot, so it has shut itself down to prevent damage or fire.
Your boiler has detected an issue with a safety thermal fuse that has tripped, which prevents the unit from firing to protect it from overheating.
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 lost the connection to the temperature sensor responsible for a specific heating zone, meaning it cannot correctly control the temperature for that part of your home.
Your boiler is having trouble reading the temperature in one of your heating zones because a sensor has developed an electrical fault.
Your boiler has lost communication with a sensor responsible for monitoring the temperature in one of your heating zones, causing it to stop heating that area.
Your boiler has lost the connection to a temperature sensor responsible for monitoring the heating system water returning to the unit.
Your boiler is struggling to read the temperature of the water flowing into your heating system because a sensor has lost its connection or stopped working correctly.
Your boiler has detected that a secondary heating circuit, such as an underfloor heating loop, has become too hot and has shut down to protect the system.
Your boiler has detected that the water temperature in one of your heating circuits has become dangerously high and has shut down to prevent damage.
Your boiler has stopped working because the water pressure inside the system is too low to operate safely.
Your boiler is struggling to detect the temperature of your hot water supply, so it has safely decided to stop heating your taps.
Your boiler is struggling to accurately measure the temperature of your hot water, which means it has stopped heating it to prevent the system from overheating.
Your boiler has lost the ability to measure the temperature of the water being sent to your radiators, so it has shut down as a precaution to prevent overheating.
Your boiler is struggling to start up and is repeatedly trying to ignite the flame without success.
Your boiler has lost its connection, meaning it cannot communicate correctly between its internal parts to start heating.
Your boiler is struggling to breathe because the internal fan that moves air through the system is not spinning fast enough to light or maintain the flame safely.
Your boiler is unable to safely move air and exhaust gases, so it has stopped heating to prevent a potential hazard.
Your boiler is struggling to switch between heating your radiators and providing hot water to your taps, which usually results in a loss of hot water.
Your boiler's control panel has lost its connection with the main computer, meaning the system cannot receive commands or function correctly.
Your boiler's internal control center is unable to talk to its main computer, causing the system to stop working entirely.
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 struggling to read the outdoor temperature correctly because the cable connected to the external weather sensor is likely damaged or loose.
BoilerFaultCodes