Hi all. I have the glow worm 28c gas boiler and the climapro2 thermostat. I have the heating set to come on at different stages of the day. I notice last night when the boiler got up to temperature it knocked of as it should do. I went to use the bathroom a while later and heard the boiler switch on again yet the temperature on the thermostat was still at what I had set it to. So why did the boiler switch on again randomly?