18 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
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 |
|---|---|---|
| 41-116-01 | Genus 27 RFFI System | 1998–2007 |
| 47-116-11 | Genus 27 BFFI Plus | 1997–2002 |
| 47-116-13 | Genus 30 MFFI | 1999–2007 |
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Your boiler is trying to start but cannot get the flame to stay lit, so it has safely shut itself down to avoid wasting fuel.
Your boiler has detected that water is not flowing through the system correctly, so it has shut down to protect itself from overheating.
Your boiler has automatically turned itself off because the water inside it has become dangerously hot.
Your boiler has stopped working because it tried to light three times but could not detect a flame.
Your boiler has stopped working because the water pressure is too low, meaning there isn't enough water inside the system to operate safely.
Your boiler has shut down because it has detected that the water inside has become dangerously hot and is potentially overheating.
Your boiler has tried to light several times during its cycle but the flame keeps going out, causing the system to lock itself for safety.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Your boiler has detected a safety issue with the flame and has shut down to prevent damage or unsafe operation.
Your boiler has stopped working because it cannot safely confirm that the waste gases are being blown out of the flue.
Your boiler is failing to light properly, which means the system cannot create the flame needed to heat your home or water.
Your boiler has detected that it is dangerously overheating even though it is not currently supposed to be running.
Your boiler has detected an issue with how it is venting waste gases, which prevents it from firing up for your safety.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Your boiler has detected that there is not enough water pressure flowing through the system to heat your home safely.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Your boiler tried to light the burner but couldn't detect a flame, so it is currently not providing heating or hot water.
Your boiler's internal computer brain has detected a safety error while trying to ignite, causing the system to lock itself down to prevent damage.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes