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I've changed the pump circulating water to the hot water cylinder in an attempt to cure this but the air keeps getting back and blocking the water flow, within a few hours. It's driving me slightly crazy now. Any ideas how to track down where the air is getting in? Many thanks

Hi, I'm replacing a Honeywell V4043 valve power head (40003916-001) on the hot water system, sat between the boiler and water cylinder. I've come to fit the replacement but the power head seems to rotate in the wrong direction: open ("manual", flats horizontal) is OK, but closed on the valve...

Hi, I've got a Trianco with a Eurostar Minor 1 oil burner that has started making a high-pitched howl from the motor (I think) that I can hear through the pipework of the house. I've bled the pump, no change, so now I'm thinking bearings? If so, are they DIYable for a "7 out of 10" skill...