5 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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 |
|---|---|---|
| 47-267-64 | i25 | 2017–present |
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Your boiler thinks a flame is burning even though it is supposed to be turned off, which causes it to shut down for safety.
Your boiler is struggling to clear exhaust gases safely, so it has shut itself down to prevent any risk.
Your boiler has stopped working because it is unable to accurately measure the temperature of the water being sent to your radiators or taps.
Your boiler's internal computer has detected a serious electronic error and has shut down as a safety precaution.
Your boiler's internal computer has developed an electronic malfunction and can no longer control the heating or hot water safely.
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BoilerFaultCodes