Have you taken the pump apart and cleaned the motor? It could be that the inside of the pump is in need of cleaning.
Take a look at this thread and follow the cleaning procedure in post 1. Note that the bearing in post 2 does not apply to the RD3. You can also try to power cycle the controller to see if that solves it as the button could be stuck but I would do a deep cleaning on the pump first. http://www.reefcentral.com/forums/showthread.php?t=2573406
I'm going to PM you my email address so you can email me with updates as I monitor my email late into the evening and am not always on the forum.
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