Hi there, hoping someone can give me the answer, my boiler is losing pressure then tripping the elecrics so it goes off, however i noticed alot of water dripping out the bottom so when i took the cover off it seems to be coming from a large sealed unit that also houses the pilot light. Today i have had replaced the Gas Valve and Pressure Vessell and still got the original problem of pressure loss and the leak underneath, when i took the cover off the boiler to look for myself the water from the unit has dripped onto the gas valve (which i didn't think needed replacing) and must of tripped electrics. Does anybody have any ideas or lend some advice as i have now spent £250 and cannot afford to conned into another part that i don't need.