My central heating boiler radiators came on in the middle of the night, even though it was set to auto off! I could hear them coming on and off every couple of minutes then it went off. I have the central heating set on timer. Also, when the central heating comes on the boiler makes a loud clacking noise as it is starting up. Another problem is when it is raining and it is very windy the rain gets blown into the flue and leaks through the boiler on the wall into the house. I have noticed that the flue pipe is positioned slightly upwards instead of horizontal, so I can see why the water is pouring in! Could this have caused the boiler to make this noise and start up when it shouldn't.