I have an intermittent problem with one pump wnet down would not go back up.I turned master power switch off then back on and it worked the first couple of times after that it took longer time un powered to get to go and the last time I dropped at home to try to figure out and after leaving off for 30 min or more I remove top and reinstalled then it decided to work.When it is repowered it flashes green inconstantly for a bit then flashes red and I know that is supposed to be a low voltage deal but my master switch has one wire going to the battery on the hot side and the other pole works flawlessly.These are 8" blades about 4 years old and not the new style.