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The worcester is supplied with a key instead of conventional filling loop! If your pressure gauge is near zero & you don't have key go to any plumbers merchant and order one it plugs in to the right of centre from underneath next to a small black knob once key is inserted and turned 90degrs turn...

Next time your near your boiler, check by looking through the eye glass that the piezo is sparking properly! It is probably that the gas valve is opening but not igniting the gas as quickly as it should. I'm not familiar with the 105e but if it has a pilot that ignites first and then the pilot...