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sorry some silly questions how do i know if the pump is working ? what are lockshields (Bleeding taps?) when you say open half a turn the ones up stairs or down starirs many thanks

Hi complete newbie for central heating can someone point me in the right direction please. I have a ideal mexico boiler a pump behind it to metal boxes with little levers under them and a thermostat that goes round the actual water container boiler thing (No laughing i know its not the...