The Carver Heater has stopped igniting in the 1996 Bessacarr Wentworth. It worked OK a couple of days ago but SWMBO wanted it on again last night and I couldn't get it to light at all. Have tried Dr Gary's suggestion about the Knob position but that doesn't seem to work. The spark seems to be very random sometimes sparking to the left of the window then the right or middle. Any ideas please