26 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 47-364-56 | evolve 24C | 2017–present |
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Your boiler has failed to ignite or stay lit, meaning it has safely shut itself down to prevent a gas buildup.
Your boiler has detected a flame when there shouldn't be one, or the sensor incorrectly thinks a fire is lit, causing it to shut down for safety.
Your boiler has shut down because it has reached an unsafe temperature, triggered by a safety sensor that prevents the unit from overheating.
Your boiler is failing to light the flame or keep it running, which means it cannot provide you with heating or hot water.
Your boiler is failing to detect a flame, which means it cannot safely light or keep itself running.
Your boiler is failing to detect a flame, meaning it cannot safely ignite or maintain its burner to provide you with heating or hot water.
Your boiler is failing to detect the flame after ignition, which means it has safely shut down to prevent gas from building up.
Your boiler has stopped working because the fan that removes waste gases is not spinning or communicating correctly with the system.
Your boiler has detected that the water pressure is either too low or the sensor that monitors it is not communicating correctly.
Your boiler has detected that the water pressure is incorrect or the sensor that monitors it is not communicating properly.
Your boiler has lost the ability to measure the water pressure accurately, which has caused it to stop running for safety.
Your boiler has detected an issue with its incoming electrical power supply, which is often caused by a voltage surge or a fault on the main circuit board.
Your boiler is struggling to accurately measure the temperature of your hot water, which usually means your taps will only run cold.
Your boiler has detected an electrical issue with the part that controls how much gas is burned, causing the system to shut down for safety.
Your boiler is failing to detect the flame correctly, so it has shut down as a safety precaution to prevent unburnt gas from being released.
Your boiler has detected that the water inside the heating system is not flowing correctly or is getting too hot, so it has shut down to prevent damage.
Your boiler has detected an issue with the sensor that monitors the water temperature in your main heating circuit, which may prevent your radiators from warming up correctly.
Your boiler has detected that the water returning from your radiators is too hot or the temperature difference is incorrect, causing the system to shut down for safety.
Your boiler has detected an unsafe level of carbon monoxide or improper combustion, which means it has shut down to protect your safety.
Your boiler has detected a blockage in the flue pipe that is preventing waste gases from safely exiting your home.
Your boiler is failing to detect a flame and has safely shut down to prevent gas from building up.
Your boiler has sensed that the exhaust fumes are getting too hot and has shut down as a safety precaution to prevent damage.
Your boiler has detected that the main part responsible for heating your water is becoming blocked or dirty and needs a professional service.
Your boiler has detected an unsafe level of carbon monoxide or improper combustion, which means it has shut down to protect your safety.
Your boiler has detected an unsafe level of carbon monoxide or improper combustion, which means it has shut down to protect your safety.
Your boiler is failing to detect a flame, which means it cannot safely ignite or stay running to provide you with heat and hot water.
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BoilerFaultCodes