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whats trv end and i/shield? the pump is on right way and working properly.

I have tried turning upstairs off and left downstairs on, i have also bleed all radiators but found no trapped air but warm water will come out from downstairs when i bleed them

Help please, I have a potterton combi 80 boiler thats 5 years old, about 2 weeks ago the heating downstairs suddenly stopped working even though it works upstairs and I also have hot water. I was informed that the cause would be the pump which i have since got replaced but im still having...