24 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Intec2 S
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Your boiler is failing to light the burner, meaning it cannot produce heat or hot water because it does not detect a flame.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Your boiler has detected that the exhaust gases leaving your home are becoming dangerously hot and has shut itself down to prevent overheating.
Your boiler has detected a communication error with its gas supply component, meaning it cannot safely ignite to provide heating or hot water.
Your boiler has stopped heating because it is unable to accurately measure the temperature of the water flowing through your radiators.
Your boiler is struggling to detect the temperature of the water for your taps and shower, which means you likely have no hot water.
Your boiler has blocked itself because it has been reset too many times while trying to fix an underlying fault, meaning it will no longer restart until a professional clears the lock-out.
Your boiler has stopped working because the water pressure inside your heating system has dropped too low.
Your boiler is struggling to detect the temperature of your hot water cylinder, which means it may not be heating your tap water correctly.
Your boiler's internal computer is receiving a confusing or garbled electrical signal due to a connection issue, preventing it from starting safely.
Your boiler has detected that the internal fan responsible for safely exhausting fumes is not working correctly, so it has shut down to keep you safe.
Your boiler is failing to detect a flame, so it has safely shut down to prevent gas from building up in the unit.
Your boiler's control panel is registering a stuck or faulty button, which is preventing the system from operating correctly.
Your boiler has detected that it is getting too hot and has automatically switched itself off to prevent any damage or safety hazards.
Your boiler is struggling to circulate water properly around your heating system, which usually means the system pressure is too low or there is a blockage.
Your boiler has detected an issue with the sensor that monitors the temperature of the exhaust gases leaving your home, causing the system to stop working as a safety precaution.
Your boiler has lost its digital connection to your smart heating controller, so it no longer knows when to turn your heating on or off.
Your boiler has detected that the electrical power it is receiving is too low to run properly, which is causing it to shut down for protection.
Your boiler has detected that the burner is failing to stay safely ignited, so it has shut down to prevent gas from flowing without a flame.
Your boiler is attempting to light but cannot successfully detect a flame, causing it to shut down for safety reasons.
Your boiler has failed to start after several attempts and has shut itself down as a safety precaution.
Your boiler is receiving an unusual signal from an optional outdoor temperature sensor, causing it to restrict its heating output to protect the system.
Your boiler is limiting its power, which means you may notice that your radiators are not getting as hot as usual or your hot water temperature is lower than expected.
Your boiler has lost its wireless connection to your room thermostat, meaning it cannot receive signals to turn the heating on or off.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes