Hi All, I'm no expert but I'll try to be as accurate as possible and it would great if anyone can help I have a Valient VCW Sine 18 T3 combi boiler, which is old but built like a tiger tank! The problem is that I cannot get any hot water, neither heating or hot water. The pilot is on OK, all rads bleed and balanced, the four bled points on the boiler also bleeding ok. The expansion vessel is pressurised OK on the air side (pressure when I press the valve and no water). The Diaphram in the water section was changed about a year ago. So when I turn on a hot tap on i can hear the pump ect and it seems to be trying to fire up, but never actually does it, though the flames do very slightly appear if you leave the tap running for about 5 minutes. Any help appreciated ;O)