We have a Baxi Potterton boiler model Suprima 40L. We had problems a few years ago and these were resolved when a new PCB was fitted, but now it's being temperamental again. Unfortunately the pilot light regularly goes out, but whether or not it can be reignited by pressing the manual reset button depends on the time of day. In the morning the boiler will always come on but at some point during its on cycle (or just when the cycle ends) the pilot light will go out and there will be a flashing red LED signal and will require manual reset to reignite. In the evening cycle, it may do the same thing - or it may not switch on at all initially and a warning amber LED signal will flash, meaning that the pilot light is trying to reignite without success. In this case sometimes it may eventually reignite. Does anyone have any ideas what might be wrong? Thanks for your help.