36 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: CaprizPlus
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's temperature gauge is having trouble reading the water heat levels, causing the system to stop heating your home as a safety precaution.
Your boiler is struggling to read the outdoor temperature, so it is defaulting to a basic setting to keep your home warm.
Your boiler is struggling to clear exhaust gases safely, so it has stopped working to prevent any risk of fumes entering your home.
Your boiler is failing to ignite because it cannot detect a flame or is not receiving a steady gas supply.
Your boiler is struggling to detect the temperature of the water coming out of your taps, which means it will likely stop providing hot water until this is resolved.
Your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.
Your boiler has detected that it is running too hot and has automatically shut down to prevent damage to its internal components.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Your boiler has lost the ability to monitor the temperature of your heating water, so it has safely shut down to prevent overheating.
Your boiler has detected that internally it is getting too hot and has automatically shut down to prevent damage.
Your boiler has detected that the water pressure in your heating system has fallen too low for it to operate safely, so it has paused its functions to protect itself.
Your boiler is failing to light the internal flame needed to heat your water and home.
Your boiler is struggling to clear exhaust fumes safely, so it has turned itself off to prevent a build-up of gases.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Your boiler is struggling to detect the flow of water through your heating system, which is preventing it from firing up to provide warmth.
Your boiler is struggling to accurately measure the temperature of the water used for your taps and shower, so it has stopped providing hot water to prevent overheating.
Your boiler has stopped working because the water pressure inside the system is currently too low.
Your boiler's computer memory has encountered a data error, which explains why the system has stopped functioning.
Your boiler has detected that the water temperature is significantly different between the start and end of its heating circuit, which usually means there is a problem with the internal sensors or the flow of water.
Your boiler is currently unable to read the water temperature accurately, which has caused it to switch itself off to prevent overheating.
Your boiler's internal computer has lost its settings and cannot communicate correctly, meaning the system is currently unable to operate.
Your boiler is unable to safely control the flow of gas required to light the burner and produce heat.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Your boiler has failed to light the flame after three attempts and has shut down for safety reasons.
Your boiler has identified an internal error that requires a professional engineer to diagnose and repair.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Your boiler is failing to light the burner, meaning it cannot provide you with heating or hot water until the issue is repaired.
Your boiler has shut itself off because it has detected that it is running too hot and could potentially damage itself.
Your boiler has lost the ability to accurately measure the temperature of your hot water, which means it will stop heating the water until the faulty sensor is replaced.
Your boiler is struggling to detect the temperature of the water being heated for your taps, which means it will likely stop providing hot water until the faulty sensor is replaced.
Your boiler has stopped working because it cannot correctly detect the temperature of the water used for your radiators.
Your boiler is struggling to read the outdoor temperature, but it should still be able to operate using its internal settings.
Your boiler has detected that the electrical power supply it is receiving is too low to operate safely and reliably.
Your boiler has detected that the air-extracting fan is not spinning at the right speed, so it has safely shut down to prevent the unit from operating without proper ventilation.
Your boiler's computer is having trouble talking to its internal parts, which has caused it to stop working completely to stay safe.
Your boiler is working normally and is currently running in a smart mode that adjusts the radiator temperature based on the outdoor weather.
BoilerFaultCodes