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Hi After using hot water a few times today (taps and shower) while the central heating was off, we noticed the pressure on the boiler rising. it was at 1.2 initially. When hot water turned on, burner fired up and pressure dropped (as it normally does to 1.1 ish). On turning hot water off...

Hi Recently noticed that our combi loses a bit of pressure after hot water is used. Boiler topped up to 1.5. When hot water is used, pressure does not go back to 1.5 -- settles at a lower level e.g 1.3 today. Would appreciate any insight into why this might be and if we need to call out...