17 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 |
|---|---|---|
| 47-077-71 | PLATINUM COMPACT 25 COMBI | 2023–present |
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 lost reliable communication with its internal electronic brain, causing it to lock out for safety.
Your boiler has lost proper communication between its internal electronic brain and its wiring connections.
Your boiler is displaying a flashing error code, which usually indicates a temporary internal glitch or safety lock out that needs to be reset.
Your boiler has detected an ignition failure or flame detection problem and has safely locked itself out to prevent gas from building up.
Your boiler is displaying a general flashing error indicator, which means the system has detected a temporary operational fault and locked out for safety.
Your boiler has detected that the burner has successfully lit, but this informational status code may indicate a temporary cycle monitoring check or require professional attention if it persists and locks out the system.
Your boiler has stopped working because a safety sensor has detected that it is running too hot.
Your boiler has detected an issue with water pressure inside the system, causing it to flash an error and temporarily stop working.
Your boiler manages to start up, but the flame keeps going out after about a minute, leaving you without reliable heating or hot water.
Your boiler is lighting up briefly, but the flame keeps going out after just a few seconds.
Your boiler's flame is unexpectedly going out while it is trying to run, which will leave you without heating or hot water.
Your boiler is trying to light up but is failing to detect a flame after a few attempts, so it has safely shut itself down.
Your boiler has detected an internal communication or flashing error and has stopped working for safety.
Your boiler has experienced a general internal electronic glitch or communication error that is causing the display to flash.
Your boiler's internal fan is continuing to run longer than expected, which usually points to a sensor or circuit board communication issue rather than an immediate safety hazard.
Your boiler is displaying a general flashing error indicator, which usually means the system needs to be reset or has detected a temporary operational hiccup.
Your boiler has temporarily stopped working because it has detected an internal communication or electrical connection problem.
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BoilerFaultCodes