Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use Insulation Mat as required)
Remove the left molex connector on the top left of the PCB marked X2 and make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset the boiler.
Appliance should now switch between F0, F1 and F43
but F61 should NOT be displayed.
Does the appliance still show F61?