hi i have a baxi 100 HE ..it gos ok for a day or so ..then the reset cuts it out ..iv had a new tank fitted and the presures up ok ...what could it be ???? please help
Most likely problem is it may be air in the system so its going out on over heat or could even be an air lock.
Best thing to do is bleed everything, any high point air vents especially (in loft etc)