9 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Main Eco System
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 |
|---|---|---|
| 41-467-02 | System 24 HE | 2006–2011 |
| 41-467-03 | System 28 HE | 2006–2011 |
Tap any card for details
Your boiler has stopped heating your home or water because it is failing to receive a proper temperature signal from its internal sensor.
Your boiler's computer system does not recognise the specific electronic board installed, preventing the unit from operating correctly.
Your boiler has lost its ability to accurately measure the temperature of the water used for your taps, causing it to shut down for safety reasons.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Your boiler has stopped working because the water pressure inside the system has dropped too low.
Your boiler is struggling to move water around your heating system, which is keeping it from heating your home properly.
Your boiler has lost power while it was already trying to report a different error, meaning the system is currently confused and needs a manual reset to restart correctly.
Your boiler has stopped working because it cannot detect a flame or is not receiving a steady supply of gas.
Your boiler has detected that the internal fan responsible for safely venting fumes is not spinning or communicating correctly, so it has shut down to prevent unsafe operation.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes