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Thanks for this tip - do I need to switch the boiler completely off (i.e. no hot water)?

thanks - I will attempt to check the expansion relief pipe. The problem is finding it (new flat with everything boxed and hidden away) Certainly no leakages on any of the pipes I can see.

Hi, I've got a Valliant combi boiler in a basement flat. I've been seeing the pressure drop to zero. It used to take about a week but now it drops to zero after about 2 days. I refill to 1 bar and it drops to zero again. I'm guessing its a leak, but is there anything I can test I...