5 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Main Combi Eco
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 |
|---|---|---|
| 47-474-02 | Combi 24 HE | 2005–2012 |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
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Your boiler has detected a blockage or restriction in the flue pipe that carries exhaust gases safely outside your home.
Your boiler has stopped working because the water pressure inside the system is too low or the internal water pump is struggling.
Your boiler has temporarily stopped working because it cannot accurately read how hot the water is inside the system.
Your boiler has temporarily shut down because the internal water temperature has gotten too hot.
Your boiler has tried to start up, but the gas failed to ignite properly.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes