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I’ve got a Valliant ecotec plus 831 . Installed 2016. Already needed new diverter valve and water pressure switch. Unfortunately did not have a Magnaclean filter fitted until now (2019)which caused sludge to block up the water pressure switch. As a result constant F75 notification where boiler wold not fire on less than 3 bar. Installed new pressure switch and now firing on 1.2 bar no problem.