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another_clean_sheet · 15th December 2019, 11:47

If the expansion tank is faulty the high pressure valve will open and let water escape. Then when the boiler is off, the water in the system cools down and you are back with low pressure again.

15th December 2019, 11:47	#16
another_clean_sheet Posted a thing or two Rover 75 CDTI Tourer Join Date: Nov 2014 Location: Great Bardfield, nr Braintree Posts: 1,416 Thanks: 303 Thanked 436 Times in 317 Posts	If the expansion tank is faulty the high pressure valve will open and let water escape. Then when the boiler is off, the water in the system cools down and you are back with low pressure again.