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is the leak coming from the bath/shower? any pipe saround where the leak is coming from?

you are topping up too high. Just top it up to 1 bar, 1.2 bar, etc Other than that it could be an expansion vessel fault.

yes, they all do. But the system has a bypass fitted.

Hello I have had a new Potterton Surpima HE boiler installed under a year ago. We have a problem that has been happening since installation really. When heating is on the boiler goes to lockout, often after having the boiler running for about 1/2 hour. The boiler manual fault light says...