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Hi folks, just changed a single rad for a double in the kitchen. Switched boiler off ( gravity fed) drained water from system. Took the old rad off and fitted the new one. Refilled the system bled downstairs rads first the the up stairs ones. Switched on the boiler, then the heating and it fires...

Hi folks, got what I think is called a system boiler. It fired up for hot water and heating but then cut out within seconds. Changed the pump ( a lot of water came out even though I had tightened both isolation valves above and below pump ) All is good with heating and hot water now. Only...