18 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Linea HE
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 is currently running at a restricted low-power setting designed for testing purposes, which may prevent it from heating your home or water effectively.
Your boiler has failed to light or maintain a flame, which means it has locked itself out to prevent fuel from building up.
Your boiler has stopped working because it has gotten too hot or the water is not circulating through the system correctly.
Your boiler has detected a blockage or a fault in the system that expels exhaust gases, causing it to shut down for safety.
Your boiler has detected that the water pressure is too low for it to operate safely, which is usually caused by a small leak or air in the system.
Your boiler has lost its connection with the external remote controller, meaning they are unable to talk to each other to manage your heating.
Your boiler has lost its ability to accurately measure the temperature of your hot water, which may cause it to run poorly or stop providing hot water altogether.
Your boiler has lost its ability to accurately measure the water temperature inside the system, which is preventing it from heating up safely.
Your boiler has reached an unsafe temperature, causing it to shut down to prevent damage or overheating.
Your boiler's internal computer has developed an error and can no longer control the heating system correctly.
Your boiler has shut itself down because the water inside it has become dangerously hot, exceeding safe operating temperatures.
Your boiler's main internal computer has detected a serious technical error and needs to be reset or potentially replaced by a professional.
Your boiler is currently set to a special testing mode used by engineers to check its performance, rather than operating in its normal heating mode.
Your boiler's setting that keeps a small amount of warm water ready for immediate use has been accidentally disabled or the internal connection responsible for this feature has come loose.
Your boiler has lost its internal configuration settings, meaning it has forgotten whether it should be running on natural gas or LPG.
Your boiler's internal settings are currently confused because a small configuration plug has been moved or become loose, preventing the heating system from turning on.
Your boiler is operating normally and there are no active faults.
Your boiler has failed to light because it cannot detect a flame, meaning you currently have no heating or hot water.
BoilerFaultCodes