I have a Baxi Solo HE boiler which has twice tripped out, leaving the lockout light permanently on (not flashing). The puzzling thing is that the Power light is out as well as the Boiler On light. Both times I have pressed the reset button and the power light has come on, followed by the Boiler On light and the boiler fires up. I have been unable to find any information on this kind of trip. Can anyone help?