hi there - im hoping someone could maybe point me in the direction with this. i had a new heating system fitted along with new danfoss thermostat (i think its the tp4000 one) 2 years ago. for the last few weeks ive noticed that when for example i set the temp to 22 c, it reaches that level- then it completely turns itself off, to the point where the radiators are stone cold- and just does'nt turn itself back on - i have to then manually over-ride the system to increase the temp- whats wrong????