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:D Many thanks for your quick reply!!! I have no idea of heating however reading different queries on this forum I had an idea you would say the expansion valve, thanks for your confirmation, makes me more confident when discussing this issue. Cheers!

Pressure is dropping on my Baxi condenser boiler after topping up the pressure daily. I have checked and there are no leaks. When I put increase pressure to 1.5 bars when I put the heating on the pressure goes over 3 bars and water is released through the outlet pipe. The pressure then...