47 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Logic Combi
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 detected a minor electronic sensor issue and is running at a lower power level to keep your home warm until it can be serviced.
Your boiler has detected a problem with the sensor that monitors the temperature of your central heating water, meaning it can't heat your radiators safely.
Your boiler has detected a problem with how it moves air and exhaust gases through the system, preventing it from firing up safely.
Your boiler has detected a sensor problem that is preventing it from providing hot water correctly.
Your boiler has tried to start up but failed to ignite the gas flame, causing the system to shut down for safety.
Your boiler has stopped working because a sensor that measures water temperature is providing an incorrect reading or has become disconnected.
There is a minor leak from a seal within the boiler's internal plumbing which needs to be tightened or replaced to stop water dripping inside the unit.
Your boiler has stopped working because an internal electrical safety fuse has blown, cutting off power to the system's control board.
Your boiler is failing to detect the correct airflow needed to operate safely, which is preventing it from firing up.
There is a small physical seal inside your boiler that has likely failed, causing a internal water drip.
Your boiler is struggling to detect the movement of water inside the system, which is preventing it from safely starting up to provide heat or hot water.
Your boiler is failing to detect that water is moving through the system, which means it cannot safely turn on your heating or hot water.
Your boiler has tried to start up but cannot light the gas flame, which means your heating and hot water will not work.
Your boiler has detected an issue with the fuel supply components specific to LPG operation, meaning it cannot safely ignite.
Your boiler has got too hot and has shut itself down as a safety precaution to prevent damage.
Your boiler has stopped working because it cannot safely clear waste gases through the ventilation pipe.
Your boiler has detected a fault with the sensor that monitors the temperature of the water leaving the unit to heat your radiators.
Your boiler is having trouble measuring the temperature of your hot water, which usually means it cannot provide consistent heat to your taps.
Your boiler has detected a problem with the sensor that monitors the temperature of the water coming back into the unit, preventing it from heating correctly.
Your boiler has detected that there is not enough water in the system to operate safely, causing it to shut down temporarily.
Your boiler's internal computer brain has lost its configuration settings and needs a professional to reset or replace it.
Your boiler has sensed a flame after it should have gone out, or before it has even started, causing it to shut down for safety.
Your boiler is struggling to heat your tap water because an internal seal or flow component is faulty, causing the system to stop working properly.
Your boiler is having difficulty transferring heat to your hot water supply, likely due to a blockage or a leak within the internal heat exchanger component.
Your boiler has detected an issue with the seal around the observation window, which could lead to unsafe gases escaping into your home.
Your boiler has detected an issue with the pressure relief mechanism, which is designed to prevent dangerous pressure build-up inside the unit.
Your boiler is struggling to detect the flow of water because the internal sensor or its protective filter is likely clogged or faulty.
Your boiler is failing to detect that you have turned on a hot water tap, so it is not igniting to heat the water.
Your boiler is struggling to switch between heating your radiators and heating your hot water taps, which may cause one or both to stop working correctly.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Your boiler is struggling to detect the flame needed to heat your water, so it has safely shut itself down to prevent any issues.
Your boiler is failing to light the flame properly because it cannot accurately detect or send the spark needed to start the fire.
Your boiler is failing to detect a flame when it tries to light, so it has safely shut down to prevent gas buildup.
Your boiler is failing to light the flame properly, which means it has stopped producing heat and hot water as a precaution.
Your boiler is struggling to accurately read or maintain the correct pressure and water temperature, often due to a faulty or blocked sensor connection.
Your boiler is failing to light because it cannot properly control the fuel supply, meaning you currently have no heating or hot water.
Your boiler is struggling to confirm it is venting exhaust gases safely, so it has stopped working to prevent any risk.
Your boiler has detected that water is not circulating properly through your heating system, so it has safely shut down to prevent damage.
Your boiler has detected trapped air inside the system, which is preventing water from circulating correctly to provide you with heating and hot water.
Your boiler's fan unit is failing to spin or communicate correctly, which forces the boiler to shut down to prevent unsafe combustion.
Your boiler's fan is failing to start or maintain the correct speed, which prevents the unit from safely venting exhaust gases and heating your home.
Your boiler has detected that one of its outer side casing panels is not fitted correctly or is loose, which prevents the boiler from operating safely.
Your boiler has detected that the seals around the combustion area are not airtight, which prevents the unit from operating safely.
Your boiler has detected that the exhaust gases are getting too hot, so it has turned itself off to prevent overheating.
Your boiler is failing to detect the airflow needed for safe operation, so it has shut down to prevent any unsafe combustion.
Your boiler is trying to start up but cannot light the gas to create a flame, meaning you will have no heating or hot water.
Your boiler has detected that it got too hot and has automatically shut itself down to prevent internal damage.
BoilerFaultCodes