Earlier in the week I was trying to clear an airlock (ran out of oil) when I inadvertently 'adjusted' the pump pressure adjuster screw. By all accounts, if this is not set correctly, the boiler is liable to run very inefficiently.
Does anyone know how I can determine the correct setting for it?
(ps - i know a service would sort this out but funds are low! Besides, its only been used for six months so it shouldnt otherwise need servicing)