3 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Logic Combi
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 |
|---|---|---|
| 47-348-77 | 24 | 2011–2016 |
| 47-348-78 | 30 | 2011–2016 |
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Your boiler is struggling because the electricity supply feeding it has dropped below the minimum voltage required to function safely.
Your boiler's electronic memory card is not being recognised, which prevents the system from starting up safely.
Your boiler has detected that the water inside the system has become dangerously hot and has shut itself down to prevent damage or overheating.
BoilerFaultCodes