Hi all, I've recently replaced both Power and Control PCB's as well as the ionisation electrode on my Chaffoteaux et Maury Britony Combi 80. When the boiler goes through start up sequence I get a flame, though it pulses, this chugs on for a few seconds before cutting out. Im so close to getting it working but am close to defeat on this! I then have to reset the system but it repeats and wont burn smooth. Any ideas on what could be causing this?