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Hi guys, Potterton 50 gas boiler, sealed system, central heating and hot water cylinder. Timer controlled. Had to shut the electric off to fix a motorised valve. Afterwards found the pressure was zero, and no hot water flowing past the circulator pump. Filled the system back up to...

I'd be really grateful for any help with this. I recently moved into my flat, and when I turned on the boiler the central heating would run constantly regardless of the demand from the timer. The hot water worked normally. In terms of setup there is a Potterton Profile 50 gas boiler...