I have changed all the fittings from oil tank to flexible hose at the boiler I did this because I had air bubbles coming in on the pipe line this cured that problem but has left me with another one. The second problem is the boiler has to be reset from the outside switch which is in the housing where the flue is. There are some weird things happening as well such as the HW/CH pump is countiuosley running if I leave the HW off the boiler fails to trip out and will run as per requested on timer.Looked at webs site sujest cold stat or oil pump may be at fault how do I prove this.any sugestions please