The temperature of the SUB Keg depends on the temperature in the fridge and the time the Keg has been in the appliance. If the temperature of the room is above 30 °C and the Keg has not been pre-chilled, it can happen that the light does not turn green. The temperature of the beer, in this case, is within 2 – 6 °C and still cooling. As long as the Keg has been in THE SUB for a couple of hours, it is not a problem that the light is still red.