This is not a fault code. Hense why you cannot find it in the service and installation book. This is a special feature of some Worcester CDi boilers .It is actually a reminder that the boiler requires a service based on burner hours.
To reset the code follow this steps;
Press and hold Spanner button until it becomes orange
Press and hold Eco button until 5A displays
CS press and release Eco button
press and release CS
Hold Until brackets appear then release
then press spanner button
Check if the burner requires cleaning by following the test producer using a mano-meter on the internal test point as outlined in the service and installations manual.
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