129 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Potterton Titanium+ / Baxi Platinum
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
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Your boiler has reached the required temperature and is taking a normal break between heating cycles.
Your boiler has detected that it is getting too hot or that water isn't moving through the system properly, causing it to shut down for safety.
Your boiler has become too hot and has shut itself down for safety, which is why your heating and hot water have stopped working.
Your boiler has briefly lost its flame and is attempting to restart itself automatically.
Your boiler is failing to light its burner after five attempts and has locked itself out for safety.
Your boiler has experienced a brief moment where its electronic brains struggled to talk to each other, but it should fix itself automatically.
Your boiler's fan, which safely pushes exhaust gases out of your home, is not spinning correctly or at all.
Your boiler's computer has hit a temporary glitch while reading its settings and is currently trying to fix itself.
Your boiler's internal memory chip has developed a communication fault or become corrupted, preventing the system from starting up.
Your boiler has encountered a minor, temporary glitch and is currently trying to fix itself automatically.
Your boiler has detected a general internal fault that is preventing it from running properly.
Your boiler's fan is not spinning correctly, which means it cannot safely remove exhaust fumes or pull in fresh air to stay alight.
Your boiler has stopped working because the electricity supply reaching it is too low to safely power the system.
Your boiler has got too hot and has shut itself down as a safety precaution to prevent damage.
Your boiler's internal computer has encountered a critical communication error and can no longer control the heating system safely.
Your boiler's internal computer has developed a serious communication error and can no longer control the heating system safely.
Your boiler has detected that there is not enough water moving through the system to keep it running safely.
Your boiler has detected a faulty internal temperature sensor, which means it cannot accurately monitor the water temperature and has stopped working for safety.
Your boiler has detected that the electrical wiring connecting it to your home's power supply is incorrectly configured.
Your boiler's internal computer has developed a fault and can no longer communicate with the rest of the system.
Your boiler has reached too high a temperature and has shut down as a safety precaution to prevent damage.
Your boiler has detected that there is too much water in the system, causing the pressure to rise above the safe operating limit.
Your boiler has detected that the water pressure in the system has dropped too low, which prevents it from running for safety reasons.
Your boiler has stopped working because the water pressure in the central heating system has dropped too low to operate safely.
Your boiler has detected that water is not moving through the system properly, which is causing it to shut down to prevent overheating.
Your boiler has failed to heat the water to a high enough temperature to kill off bacteria, usually because the hot water hasn't been used or heated fully for a while.
Your boiler started to work but the flame went out unexpectedly while it was running.
Your boiler has tried to light several times but cannot successfully stay lit, resulting in a lockout for safety.
Your boiler has been manually reset too many times or the reset button has been held down for too long, causing the control system to temporarily lock itself.
Your boiler's fan is not spinning at the correct speed, which prevents the system from safely venting gases and starting the ignition process.
Your boiler is struggling to safely clear away exhaust fumes or pull in fresh air, causing it to shut down as a precaution.
Your boiler is having trouble detecting the flow of water through the system, which is preventing it from heating up correctly.
Your boiler has detected a problem with how air is moving through the system, meaning it cannot safely clear waste gases and has shut down as a precaution.
Your boiler has detected that it is heating up too quickly because there isn't enough water moving through the system to carry the heat away.
Your boiler has detected a problem with its electrical safety grounding, which is preventing the system from running safely.
Your boiler has shut down because it has detected that the water inside is getting too hot, likely due to a circulation problem.
Your boiler has stopped working because it cannot accurately measure the temperature of the water returning to the unit.
Your boiler has detected a problem with the sensor that monitors the water returning to the unit, meaning it cannot accurately track temperature and has stopped working for safety.
Your boiler has detected that the water coming back from your radiators is hotter than the water going out, which usually means the water sensors are confused or there is a circulation problem.
Your boiler is struggling to keep its flame lit and has shut down for safety after failing to stay ignited multiple times.
Your boiler's fan is not spinning at the correct speed to safely clear exhaust fumes, likely due to a mechanical failure or strong wind blowing back into the flue.
Your boiler has stopped working because it thinks the water returning to the unit is hotter than the water leaving it, which is often caused by a circulation blockage or a trapped air pocket.
Your boiler has stopped working because water is not moving through the system properly or a temperature sensor is disconnected.
Your boiler has shut down because it has become too hot internally, likely due to a lack of water flow or a sensor issue.
Your boiler has recorded that the reset button was pressed and it is currently performing a brief self-check before restarting.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Your boiler's internal computer has suffered a serious electronic failure and can no longer communicate with the heating system.
Your boiler's electronic control board can no longer talk to the gas supply unit, meaning the system cannot safely manage the fuel needed to start the heater.
Your boiler's internal computer settings have been changed or are set incorrectly, meaning the control board doesn't know which specific model it is operating.
Your boiler's internal configuration settings have been altered or are correctly mismatched with the control board's software.
Your boiler's internal computer settings have been altered or are misconfigured, preventing it from functioning correctly.
Your boiler has lost communication with an external control, such as your thermostat or programmer, likely due to a loose wire or electrical fault.
Your boiler is having trouble communicating with your wireless thermostat or external controller.
Your boiler has lost communication with the gas control valve, meaning it cannot safely ignite to provide heating or hot water.
Your boiler has stopped working because one of its internal heat sensors is reporting a faulty connection and can no longer measure the water temperature correctly.
Your boiler has lost its connection to the sensor that monitors water temperature, causing the system to shut down for safety.
Your boiler has shut down because it is overheating, which usually means the water is not moving through the system properly.
Your boiler has identified an issue with the sensor that monitors exhaust gases, causing it to shut down for safety.
Your boiler has detected a problem with the sensor that monitors exhaust fumes, causing it to shut down for safety.
Your boiler has detected that it is getting too hot and has shut down as a safety precaution to prevent internal damage.
Your boiler has shut down because it has detected it is getting too hot, likely due to a lack of water flow or a faulty sensor.
Your boiler has failed to ignite, which means it isn't getting enough gas or cannot create a flame to provide warmth and hot water.
Your boiler detects a flame when there shouldn't be one, or the internal burner is overheating, causing the system to shut down for safety.
Your boiler has detected that the fan responsible for clearing exhaust fumes is stuck or not spinning correctly, preventing the system from starting for safety reasons.
Your boiler has detected a serious internal communication or hardware failure regarding how it manages gas and air, preventing it from firing up safely.
Your boiler's internal thermometer has stopped communicating correctly, meaning the system can no longer reliably tell how hot the water is.
Your boiler has become too hot and has shut down as a safety precaution to prevent damage.
Your boiler is struggling to move water around the heating system, which is causing it to stop running to prevent overheating.
Your boiler's internal computer has encountered a critical error and can no longer communicate with the rest of the system.
Your boiler is struggling to light its flame, which could be caused by air trapped in your system or a gas supply issue.
Your boiler has lost its connection to the gas control system, meaning it cannot safely release fuel to create a flame.
Your boiler is struggling to understand the temperature outside, which may cause it to run less efficiently or use the wrong settings for your home.
Your boiler has detected that water isn't moving through the system properly, which has caused it to stop running for your safety.
Your boiler has detected that a internal water flow sensor is stuck in the 'on' position, preventing the system from starting its safety checks.
Your boiler's electronic control board has detected a communication error or a fault with the gas valve, causing the system to shut down for safety.
Your boiler's temperature sensor has developed a fault or is disconnected, preventing the system from heating your home properly.
Your boiler has detected a problem with how it disposes of waste gases or a blocked drainage pipe, causing the system to shut down for safety.
Your boiler has detected a problem with the sensor that monitors the temperature of the water returning from your radiators.
Your boiler's temperature sensor for hot water has developed a fault, meaning the system cannot accurately monitor or provide hot water to your taps.
Your boiler has detected that the exhaust gases are not clearing properly, which could mean the flue pipe is obstructed.
Your boiler is struggling to detect when you turn on a hot tap, which may result in your water failing to heat up or turning cold unexpectedly.
Your boiler has lost its settings and needs to be recalibrated to ensure the gas and air are mixing correctly to heat your home.
Your boiler has detected an issue with the sensor that monitors internal water pressure, meaning it cannot confirm if there is enough water to run safely.
Your boiler's internal computer has lost contact with its control sensors or external thermostat, meaning it cannot receive instructions to provide heat or hot water.
Your boiler has detected an issue with the fuel and air mixture while trying to calibrate itself automatically.
Your boiler's internal computer has lost track of the correct time and date, which may prevent your heating schedules from working correctly.
Your boiler is struggling to move water through the system efficiently, which is often caused by a blockage or a pump issue.
Your boiler has likely overheated, causing a safety sensor to automatically shut the system down to prevent damage.
Your boiler has detected that the water pressure in your pipes is too high, causing the system to stop for safety.
Your boiler has stopped working because the water pressure inside the system has dropped too low and needs to be topped up.
Your boiler has stopped working because the water pressure is too low and needs to be topped up.
Your boiler has detected that hot water isn't moving through the system properly, which is usually caused by a trapped air bubble or a pump that has stopped working.
Your boiler has lost its flame multiple times in a short period and has now shut down for safety.
Your boiler is struggling to maintain a steady flame during its automatic setup process, causing it to shut down for safety.
Your boiler has shut down because a sensor has detected that the exhaust gases are getting too hot, which is a safety feature to prevent damage.
Your boiler has shut itself down because it detected that the exhaust gases have become too hot, which is a safety measure to prevent damage.
Your boiler has failed to light because it either isn't receiving gas or is unable to detect a flame.
Your boiler is struggling to ignite because it cannot detect a flame despite trying to open the gas valve several times in a row.
Your boiler has lost its connection to the gas supply due to an internal electronic error or a blockage, meaning it cannot ignite to provide heating or hot water.
Your boiler has noticed that its internal temperature sensors are giving conflicting readings, causing it to shut down for safety.
Your boiler has detected a problem with the fan that helps clear exhaust fumes, meaning it has stopped working for your safety.
Your boiler's fan, which safely pushes exhaust gases out of your home, is not spinning at the correct speed or has stopped working entirely.
Your boiler has detected a problem with the sensor that monitors hot water temperature, which means it may not be able to heat your taps and showers reliably.
Your boiler has detected an issue with the sensor that monitors water pressure, which is preventing it from heating your home or water.
Your boiler's internal computer has encountered a communication error and cannot control the system properly.
Your boiler's internal computer is confused or struggling to communicate, often due to an electrical interruption or a failing component.
Your boiler has detected that water is not moving correctly around the system before it starts the heating process, often due to a blockage or trapped air.
Your boiler has detected that water isn't moving through the system properly, which is causing it to overheat too quickly.
Your boiler has detected an issue with the electrical power timing coming into the unit, which is preventing it from running safely.
Your boiler's hot water sensor is not reading the temperature correctly, which stops it from providing hot water.
Your boiler thinks there is a flame present even when it hasn't been told to ignite, causing it to shut down for safety.
Your boiler is receiving an inconsistent or low supply of electricity, which is preventing it from running safely.
Your boiler is performing a temporary check to ensure there is enough water pressure to operate safely.
Your boiler has lost its connection to the gas control system, meaning it cannot safely ignite to provide heating or hot water.
Your boiler is overheating because the water isn't moving through the system quickly enough or the temperature sensors are giving conflicting readings.
Your boiler is overheating or water isn't moving through the system fast enough to keep the unit cool.
Your boiler has detected that the internal water is getting too hot too quickly, often because the water isn't moving through the system properly.
Your boiler has detected that water isn't moving through the system properly or a sensor is misreading the internal temperature.
Your boiler is heating up too quickly when you try to use hot water, often because water isn't flowing through the system fast enough.
Your boiler’s internal computer has lost its settings and doesn't know how to operate correctly, likely due to a recent repair or a power interruption.
Your boiler is momentarily confused by its internal electronic settings and needs a quick restart to synchronise its software.
Your boiler's computer system is confused and cannot identify its own settings, causing it to stop working for safety reasons.
Your boiler has detected that the water pressure is too low for it to operate safely, likely due to a minor leak or the system needing a top-up.
Your boiler is struggling to read information from its internal temperature sensors, which is preventing it from heating up correctly.
Your boiler's internal computer is having trouble talking to its main control board, which has caused the system to stop working for safety.
Your boiler has lost its flame while it was running, which means it has stopped providing heat or hot water for safety reasons.
Your boiler has lost all electrical power and is currently switched off or disconnected from its power source.
Your boiler has tried to light several times but cannot establish a flame, meaning it has shut down for safety.
Your boiler has detected an internal electrical communication problem and has shut down as a safety precaution.
BoilerFaultCodes