i reset the boiler the fan kicks in then it tries to ignite but then it just clicks out,ive replaced pcb+gas valve+its was neither of them what can it be,can anyone help?
can you see a spark through the sight glass when it tries to ignite?
was the pcb the new complete rewire version and did you change the ignition lead as wall?
do you have any other gas appliances and are they working ok?
do you have a card meter?