My Chaff! Britony combi 80 runs through it's start up sequence but goes on lockout after 8 seconds due to the gas soleniods not opening.
The boiler goes through it's normal start, fan runs, the electrode sparks ok, water pressures ok, everything seems ok but won't light up.

john M, July 2008

electrode sparking is last in ignition sequence so suggests you may have a faulty gas valve/control or supply problem.

i suggest you get a repair engineer.

iain, July 2008