Hello all. Been babysitting an old Baxi105e for three years and it's not a disaster but a bit temperamental. Current niggle : first time in the day, the CH side only fires up if the Hot water is run at the tap first for a few minutes. On turning the hot tap off the CH smoothly takes over and continues to temperature. When the CH fails to fire up, the 'Low pressure / faulty pump' alert light comes one, though the pressure gauge shows just over 1 bar and the pump makes no noise and seems fine. Any ideas ? Thanks.