Was in my local plumbers merchants on Friday and the conversation turned to the above boiler.
I observed how poor they are and that I had only stopped mine from randomly locking out by removing the PCB and re-making all the soldered connections. Whereupon, bloke behind counter commented that he had replaced his Suprima after the heat exhanger had crumbled away and also that Potterton had changed the PCBs in all unsold Suprima boilers last year having changed the PCB manufacturers. Interesting, no?
Richard