9 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Logic
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. 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 |
|---|---|---|
| 47-348-38 | mini HE C24 | 2004–2011 |
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.
Tap any card for details
Your boiler has stopped working because it has detected an issue with water flow, internal temperature, or system pressure.
Your boiler has automatically shut down because the water inside it has become dangerously hot.
Your boiler's central heating sensor has stopped working correctly, so the system cannot accurately measure its own temperature and has shut down for safety.
Your boiler is struggling to accurately measure your hot water temperature, which usually means it will stop providing hot water properly.
Your boiler has detected that hot water is not circulating properly around your heating system, which is preventing it from staying operational.
Your boiler has detected an issue with the gas supply pressure during the ignition process and has safely locked itself out to prevent unsafe operation.
Your boiler is failing to light the flame needed to generate heat or hot water, so it has purposefully shut itself down to remain safe.
Your boiler has detected that the incoming gas supply pressure is too low to operate safely and efficiently.
Your boiler is currently running normally and providing central heating to your home.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes