There are two lights on the 972A6 electric blanket control, one behind the temperature dial to indicate the selected temperature setting, and one labelled Timer Off.
When the blanket is switched ON and heating (i.e. during the selected timer period) the light behind the temperature dial illuminates to indicate that the blanket is on and heating, and the timer light is OFF.
Once the timer period has ended the temperature dial light goes out and the blanket switches off. The Timer Off light illuminate to indicate that the timer period has ended. To restart the timer period, move the slide switch to the off position then back to the selected timer setting.
If a fault is detected within the blanket, the timer light will FLASH.