My vaillant ecotec pro 28 He combo Ng has come up with a F75 fault.I can reset it and everything's fine until the next morning when I've got no heating or hot water. I've checked the water pressure bars which read 2.5 which I think is o.k. its under two years old.

linda, October 2014

because you have low water pressure ,you fill it up now its to high take air from radiators ,bleed all Rads ,air lock in system make sure auto air vent is open build in with pump ,undo big silver nut on pump half turn when water come out close it pressure to be 1,5 bar if still problem change water pressure sensor

ltd, October 2014