Red light continues to blink after closing valve on black tank

Opened electric valve to flush black tank. When I closed the valve the red light continued to blink. I'm guessing the valve is sticking partially open, but I am hoping to get some input from you guys, before I move forward. Thanks for any help I get. Rick

Had same problem caused by crud build up keeping gate valve from closing completely.  Obstruction can sometimes be cleared by completely filling and emptying black tank.  I eventually replaced the gate valve after trying several fush methods.

Thanks for the response. I will give that a try in the morning. Rick

Had to flush several times, but it did the trick. Thanks Rick

Thanks for the response. I will give that a try in the morning. Rick

pushing the handle toward the close position while the electric valve is completely closed it will stop  blinking

Thanks