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macafee2 · 7th November 2019, 09:54

You have a leak. As the heating heats the pressure will increase and then drop as it cools. Does the boiler have a pressure release valve, if this has given up (become weak) it could be allowing water to escape to the drain or the outside

macafee2

7th November 2019, 09:54	#2
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,937 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	You have a leak. As the heating heats the pressure will increase and then drop as it cools. Does the boiler have a pressure release valve, if this has given up (become weak) it could be allowing water to escape to the drain or the outside macafee2