The 6 temp lights on my boiler (Chaffoteaux 30FF)are flashing and the boiler has tripped out,I can reset the boiler and it will go for a few days OK then it happens again. I have noticed that the fan switches off at the same time as the flame, not sure but i think the fan usdto stay on for 20 secs or so after the flame went out, could this be the problem?