Pump cycles on and off more than once a minute. Water inflow excessive. Observe source and amount of water inrush. Have larger sump and pump installed. Defective or inoperative check valve. Observe backflow of water from discharge. Check gate of check valve. Clean gate of check valve or install new check valve. No check valve in high head installations. Examine and observe. Install check valve. Floats or weights improperly adjusted. Add water to sump and observe turn-on. Readjust control floats or weights. Sump basin size too small or pump to large for sump pit.Measure sump width and depth and compare with manufacturer's recommendations. Install smaller pump or install larger sump basin.