19 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Thema
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 |
|---|---|---|
| 47-920-45 | EnviroPlus F24e | 2004–present |
Tap any card for details
Your boiler is trying to start up but is failing to light the burner, which means you currently have no heating or hot water.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage or safety risks.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent any damage or safety issues.
Your boiler's temperature sensor is failing to provide a reading, so the system has shut down to prevent overheating.
Your boiler is struggling to detect the temperature of your hot water supply, so it has safely shut down to prevent overheating.
Your boiler is struggling to accurately detect the water pressure inside the system, which is preventing it from firing up safely.
Your boiler is unable to accurately measure the temperature of the water returning to it, so it has stopped working to prevent potential damage.
Your boiler's internal computer chips are failing to talk to each other, preventing the system from running safely.
Your boiler's electronic control panel is not 'talking' to the main brain of the system, meaning the boiler has shut down for safety.
Your boiler's internal computer is experiencing a communication error, meaning it can no longer safely control the heating system.
Your boiler is struggling to control its internal gas supply, which prevents it from igniting safely.
Your boiler is failing to detect a flame, so it has shut itself down to keep your home safe.
Your boiler has detected that the incoming electricity supply is not strong enough to run it safely, causing the system to shut down.
Your boiler's digital display or control panel is having trouble communicating with the main system, preventing the boiler from receiving instructions.
Your boiler has detected that a temperature sensor has come loose from the pipe it monitors, meaning the system can no longer accurately read the water temperature.
Your boiler's electronic control parts are unable to communicate with each other, causing the system to shut down for safety.
Your boiler is overheating because the water returning to it from your radiators is getting far too hot, causing the system to shut down for safety.
Your boiler is heating up much faster than expected, suggesting that water is not circulating properly through the system.
Your boiler has detected that the water is heating up or cooling down far too quickly, which usually indicates that the internal pump is failing to move the water around the system properly.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes