I bought a 3155 almost a year ago and it worked flawlessly until this weekend. I came home to the alarm going off with the water level at the high water mark. I unplugged it for the night, then drained my sump to the proper level, cleaned everything off and plugged it back it. It turned on, added water, and shut off at the proper level and I assumed it was fixed - but then the same thing happened about an hour later.
Any advice?
Any advice?