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The valves are asleep all of the time. They have to be, because the batteries will last a year. They wake up every 7.5 minutes to talk with the Genius Hub and then go back to sleep again. If you make a change on the app and them immediately go to the valve it may take up to 10 minutes for the valve to get this change. The reason for a valve's slow reaction time in the first week is that there are 500 steps in the electronic valve from the fully closed position to fully open. This makes it extremely accurate and quiet when controlling to a set point temperature in normal operation. When a valve is first mounted on a radiator it has to learn the 'on' position, so it can work efficiently and react faster in the future. When it is in this 'learning mode', each time the valve is called to heat a room it opens 5 steps, waits to see if the temperature of the hot water flowing through the valve body (the metal part that the water flows through) changes, and then after another 60 seconds it opens another 5 steps etc. When mounted on the flow side of the radiator it will normally have established the 'on' position of the valve after about 15-20 minutes, it will store this in its memory and will then fully open as usual to allow the radiator to warm up.
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