Mariusium4 years ago000Does the display or another light on the unit light up? It should be completely without lights in the bedroom.Show in original language (German)sasackie4 years ago • purchased this product+1+10purchased this product Helpful answerNo, nothing lights up. Only the relay shortly after plugging it in. Otherwise you hear noises when the valves open/close the heating.Show in original language (German)Comment