got the same problem with my boiler,
keeping locking out and need to press reset ,
the plumber came and had a look and told me need to change the board,
he says there a new board that replace the old board from potterton boilers,
(boiler about 2001 year - had not serviced it - oops)
but he says it will cost €450,
is that how much the new potterton board costs????
or is he ripping me off??
will i be better to get a new boiler?? the efficient one??