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Thanks for the response, I'll check the exp vessel. In the meantime, I reduced the system pressure to just above 1 bar, and with CH on pressure seems to stabilise around 2 and a quarter, so hopefully it will see us through the winter. Regards Colin

Recently the low system pressure warning light came on although guage displayed pressure at 1.5 bar. I intially disconnected the switch, and boiler fired up on hot water demand and central heating. I replaced the switch and everything seemed fine. I noticed however that when central heating was...