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thanks for the quick reply, there is only one pump in the system and its a small terraced house, so i guess that the water is pumped up to the main tank (hot press) and on through the radiators powered by the same pump(?) apologies for the lack of knowledge, i'm just trying to diagnose as...

Hi Everyone, Two days ago, when i turned my heating on first thing in the morning, it immediately tripped the mains RCD. I went out to the boiler (its in a little 'outhouse' in the back yard) and flicked the isolator switch, changed the fuse and tried again. Same result. Starting from the...