What the manual says
Manufacturer manualThe last fault occurred (if a fault has occurred, the display will show 0.0 and the last fault).
From this model's manual
Verified against the Worcester Bosch 537i installation & service manual.
DIY fix possible
Press the 'Reset' button to return the boiler to its normal operating displayCheck if your heating and hot water are functioning as normalMonitor the display to see if a specific error code (e.g., EA or F7) appears alongside this code
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