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 |
|---|---|---|
| 47-267-65 | i29 | 2017–present |
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Your boiler thinks a flame is burning even when it’s supposed to be turned off, which causes it to shut down as a safety precaution.
Your boiler is struggling to clear exhaust gases because it cannot confirm that the internal fan is moving air properly, so it has shut down for safety.
Your boiler has stopped working because it is unable to accurately measure the temperature of the water flowing out of it.
Your boiler's internal computer has developed an electrical fault and is unable to communicate with its sensors properly.
Your boiler's internal computer has developed a critical electronic fault and can no longer control the heating system safely.
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BoilerFaultCodes