I just purchased a 6212 from someone here on RC. I installed it and it ran good for 1 day. Now the powerhead in the tank will not run even though the lights on the controller are switching. If I unplug the power and plug it back in I get 1 pulse out of the powerhead and that is it. It will continue to pulse 1 time every time I disconnect/reconnect the power. Any ideas what is going on? Thanks