I don't think there is a flow switch error light on that boiler, please prove me wrong someone?
So if there is only a red lockout light press in hard on the red overheat stat protrusion knob underneath to the left if I remember right, and also reset the pcb by moving power selector switch past off to reset position hold for a while and return to run. Also pehraps cutting power to the boiler alltogether counting to 10 and reinstating power (like rebooting an IBM XT).
Mr Barker you are correct, there is no flow switch error code or indeed any codes as far as i know, just some grey knobs with ickle bumps on em.
Do as requested and reset, underneath , to front left, red button, very small.
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