We own a house with an old central heating programmer which is not working correctly (hot water only works with heating on).I am thinking of replacing it but the lid with the name is missing. It is rectangular plastic with a display window set to left hand side with separate sliders for the central heating & hot water at the bottom. There is a vertical slide bar to the right hand side with run,set on it. Can anyone identify this for me and advise which one I need to replace it. The thermostat on landing doesn't seem to control temperature either - can anyone suggest what the problem is?