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Hi ETAF, yes the pressure drops gradually over a period of 2 weeks. When it drops too low then boiler errors out to F1. When this happens I have to re-pressurise (top up) the system. Cold pressure is 1bar Hot (boiler running) pressure us 1.2 As I mentioned, during the summer months the...

Thanks DP. The pressure only drops when the boiler is running. For instance, it can go through most of the summer without needing to top up. There are no leaks in the system. There is nothing coming out of condensate pipe when boiler not running. Any thoughts on the theory of pin hole leak in...

Hey, I've pulled the house apart. There is no leak in the system . 2 different plumbers who came to service the ideal 30 said it was working fine. I think that there is a leak in the heat exchanger. Most Internet info about cracked heat exchangers say that there would be signs of water in the...

Hi @ LJM, I realise it's been a while since you had this problem. I have the exact same issue. Did the new heat exchanger solve the problem in the end?