9 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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 |
|---|---|---|
| 47-094-71 | 29HE | 2005–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.
Tap any card for details
Your boiler is currently protecting itself by performing a self-check on the water temperature sensors to ensure it is heating safely.
Your boiler is struggling to accurately detect the temperature of the water being heated for your taps, which means it may fail to provide hot water or heat it to the wrong temperature.
Your boiler is pausing temporarily due to a minor safety check, such as a drop in system water pressure or a momentary blocked air signal.
Your boiler has detected a critical internal safety fault and has locked itself down to prevent damage, meaning it will not provide any heating or hot water until a professional engineer repairs it.
Your boiler is currently running in a special diagnostic test mode used by heating engineers, rather than a normal heating mode.
Your boiler is operating normally and is currently in standby mode waiting for a signal for heating or hot water.
Your boiler is operating normally and actively fulfilling a request to provide heating or hot water.
Your boiler has stopped working because it can no longer accurately read the temperature of the water inside the heating system.
Your boiler is struggling to accurately measure the temperature of your hot water, which means it may fail to provide hot water or heat it to the wrong temperature.
BoilerFaultCodes