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Sorry to sound ignorant but what doe sthis part do and how does it rectify my problem? Thanks for reply.

The pilot light on this boiler will light but once I let go off the gas supply button (having held it in for a minimum of 15 seconds) it just goes out. I have cut the power to the boiler and turned the gas thermostat dial to zero as per the instructions. Does my boiler need a service or am...