We have a fault that when we turn the hot tap on we do not always get hot water, the boiler does not ignite, turn the tap off and it may ignite, not always and then turns itself off. We may use the hot water for a few hours whithout any problem, say all morning, go back to do the lunch washing up and it will not ignite. We have had a number of plumbers look at this over the years but they have never cured it

Brian Mitchell, September 2011

look like gas valve is sticking ,before check spark area is clean with WD 40 and clean with wet paper

ltd, September 2011