Could be faulty circuit board - common problem with the Suprima. Sometimes taking it out (if you are a tech) and resoldering all the joints will fix it. There are companies on the net selling replacement PCBs at a fraction of the price of new
Ronnie
January 2010
no pilot, no thermocouple, it's automatic ignition. pcb's are notoriously faulty on earlier models of this boiler causing intermittent lockout.
Ian
January 2010
I can answer this question...
My pilot light allways goes out on potterton suprima?