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If you remove the handel and open thr top of the actuator you will see a set nut on the center of the shaft that you use to set where the valve stops. If this is tight then you may have a bad micro switch in the unit and you should replace the actuator. Good luck.
Make sure the tire pressure is proper..
Be sure to rotate them every 6-k miles or so..
If they are not rotated - the tread could get the fish-scale effect..
Run you open hand gently across the tread in the direction of up and down - not side to side..
If you feel the fish-scale effect - it is from not rotating them and that is what is causing the humming noise..
Rotate them asap.. if it has been TOO long - the "humming" might not go away until your next set of tires..