This might seem silly question but am ignorant of such techy matters. I have a wall mounted Honeywell T40 Thermostat on the stairs wall and I want to know if it is still connected to central heating and can it be removed when next decorating. It has not been touched (adjusted) for well over 10 years, in fact the dial is cracked and doesnt work. I think it is the original which has been there for 42 years during which time the central heating boiler has been replaced twice (now Glowworm 30) and the hot water cylinder and cold water header tanks have been removed. Each room radiator has its own thermostatic valve which all work fine. So can I just remove it rather than have to replace it as it looks naff with the crack or is it still performing a function? tia.