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The pressure is dropping when the water cools what pressure do you set it too when it locks out?
It needs to be set at about 1.2 Cold or 1.6 to 8 hot. if its then losing pressure through the day you have a leak somewhere, or the pressure relief valve is letting water by.
its not necessarily leaking when its cold. When the water is hot it expands and increases the pressure, as it cools it retracts and you lose pressure. Thats why you set your pressure to 1.2 cold or higher when its hot.