Observation:

The Status Codes can be used to ascertain which mode the boiler is running in.
Access the codes by pressing the - button for at least 5 seconds until S and a number alternately flash in the display. The number can be cross referenced with the table below.
S.01 = No Heating Required
S.02 = Fan Pre-run
S.03 = Pump Pre-run
S.04 = Burner on
S.05 = Fan/Pump Overrun
S.06 = Fan Overrun
S.07 = Pump Overrun
S08 = Anti-cycle
Note:
For the complete list of status codes refer to ADAPT.