Update: bolier now fires up if I push it to on position, but if I turn a tap on or flush the toilet the heating shuts off until I manually turn it off and wait a few seconds turn it on it fires up again. Appreciate any ideas why it's doing this now considering we have done nothing it.
Also...
Hi thanks for the quick reply mick. We have had 2 out 1st one did not do much tried air flow pressure switch then said problem the fan, did not check any points on the boards. 2nd way young lad very honest said he did not know much about Worcestershire but tried said the bolier is getting on...
My 350 combi is not lighting at all, the same usual sequence of clicks and ticks, the fan starts and runs but you can not hear the usual clicking from the ignition/spark to light the burner. It just will not light and the fan just keeps running all the time, no hot water, no central heating...