61 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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Your boiler is struggling to detect or control the speed of the internal fan required to safely vent exhaust gases, so it has stopped operating to protect your home.
Your boiler has lost power to its internal control system due to an electrical fault, causing it to stop working completely for safety.
Your boiler thinks it sees a flame even though it hasn't tried to light yet, which is causing it to shut down for safety.
Your boiler is failing to light the fuel needed to create heat, meaning the system has stopped working for safety reasons after several failed tries.
Your boiler's computer has lost its configuration settings or has been programmed incorrectly, meaning it doesn't know how to operate safely.
Your boiler has received a signal from an outside control system to stop running, often due to an external safety switch or building management setting.
Your boiler has lost power following a previous internal error, which has likely caused it to stop providing heating and hot water.
Your boiler is displaying standard status codes to show it is working normally or warming up, rather than indicating a fault.
Your boiler's internal computer parts are struggling to talk to each other, causing the system to stop working entirely.
Your boiler has sensed that the water returning from your radiators is too hot, which usually means water isn't moving through your heating system correctly.
Your boiler has shut down because the water inside it has become too hot, which is usually caused by a circulation problem or a blockage.
Your boiler has stopped working because its internal fan is not spinning at the correct speed or is running when it shouldn't.
Your boiler has stopped working because the internal fan is not spinning to clear out waste gases.
Your boiler has shut down because it incorrectly detects that water returning to the unit is hotter than the water leaving it, which usually points to a sensor or circulation issue.
Your boiler has stopped working because it thinks the main internal thermometer has developed an electrical fault and can no longer accurately measure water temperature.
Your boiler has stopped working because it thinks one of its internal temperature sensors is faulty or has short-circuited.
Your boiler has stopped working because it cannot detect the temperature of the water coming back into the unit.
Your boiler has stopped working because it cannot detect the temperature of the water leaving the unit, leading to a safety shutdown.
Your boiler's outside weather sensor has developed an electrical fault, which may cause your heating to run at the wrong temperature or not at all.
Your boiler's computer has lost its specific configuration settings, meaning it doesn't know how to operate correctly and has shut down as a precaution.
Your boiler has lost its flame while it was running and has shut down as a safety precaution.
Your boiler has shut down because a safety circuit has been broken, which is typically caused by the system overheating or an electrical safety switch being triggered.
Your boiler has stopped working because it cannot correctly measure the temperature of the water returning from your radiators.
Your boiler is having trouble controlling the speed of its internal fan and will shut down for safety after trying to restart several times.
Your boiler is struggling to control the speed of its internal fan and will shut itself down for safety after five failed attempts to start.
Your boiler is overheating because water isn't moving through the system quickly enough, causing it to take a ten-minute break to cool down.
Your boiler has temporarily paused because an external safety device or control switch has disconnected the system.
Your boiler has switched itself off because the water inside is heating up too quickly or isn't circulating properly through your radiators.
Your boiler is overheating because water isn't moving through the system quickly enough, causing it to temporarily shut down to protect itself.
Your boiler’s internal computer settings have become scrambled or were adjusted incorrectly, causing the system to stop working for safety.
Your boiler has temporarily stopped working because it has detected a specific operating condition that requires it to pause for safety or system protection.
Your boiler has stopped working because its internal sensors are sending a confused signal to the main control board.
Your boiler has tried to start but failed to light the flame, leaving you without heating or hot water.
Your boiler thinks a flame is burning even when it shouldn't be, causing the system to shut down for safety.
Your boiler's internal computer has developed an electronic hardware fault and can no longer control the heating process safely.
Your boiler is failing to light or stay lit, meaning it cannot safely generate heat and has locked itself out.
Your boiler’s internal computer has encountered a critical error and cannot communicate properly to manage the heating process safely.
Your boiler's internal computer brain has detected a software or electronic processing error and has stopped working for safety.
Your boiler has shut down because it has detected that the water inside has become dangerously hot, causing the safety overheat thermostat to trip.
Your boiler is confused because it senses temperatures in the wrong order or detects an extreme difference in heat levels, causing it to shut down for safety.
Your boiler has detected an issue with the internal component that manages the gas supply, so it has safely shut itself down to prevent any unsafe operation.
Your boiler has detected that water is the wrong temperature as it enters and leaves the unit, essentially indicating that the water is not circulating through your radiators properly.
Your boiler's internal computer has detected a fault with one of its built-in temperature sensors, causing the system to shut down for safety.
Your boiler has shut down because it has detected an unsafe build-up of heat or a lack of water circulation within the main system.
Your boiler has shut down because the internal water temperature has risen too quickly, suggesting a blockage or a circulation problem.
Your boiler has stopped because water isn't moving through the system quickly enough, causing it to overheat too rapidly.
Your boiler has shut down because it thinks the water returning from your radiators is hotter than the water leaving the boiler, which suggests a sensor error or a circulation problem.
Your boiler has stopped working because it cannot correctly measure the temperature of the water returning to the unit.
Your boiler has detected a problem with the sensor that monitors the temperature of the water leaving the unit, causing it to shut down as a safety precaution.
Your boiler is heating up too quickly because water isn't moving through the system properly, causing it to shut down to prevent overheating.
Your boiler has detected a safety issue with the gas control system and has shut down to prevent any hazards.
Your boiler's internal computer has encountered a fault that is preventing it from running properly.
Your boiler has stopped working because the internal fan is not spinning at the correct speed to safely clear exhaust gases.
Your boiler's internal computer parts are struggling to talk to each other, which means the system cannot coordinate the heating process.
Your boiler's internal computer parts are struggling to talk to each other correctly, which has caused the system to stop working.
Your boiler has stopped working because it cannot safely vent exhaust gases or draw in fresh air due to a blockage in the pipes.
Your boiler’s internal computer has lost its configuration settings and no longer knows how to operate the system safely.
Your boiler is struggling to communicate with its external controls, likely because a safety feature has been triggered to prevent your pipes from freezing.
The main computer brain of your boiler has developed a serious internal fault and is no longer able to control the heating process safely.
Your boiler is currently operating normally as intended and is cycling through its standard startup sequence.
Your boiler is currently in a manual service or configuration mode intended for technicians rather than a standard operating state.
BoilerFaultCodes