U.S. Motors pool pump causes loud water hammer or banging noises in the plumbing when starting or stopping.

Safety first: Turn off power before adjusting valves or programming.

• Adjust start/stop ramp: On variable-speed U.S. Motors pumps, program a slower ramp-up and ramp-down of speed to reduce sudden flow changes.
• Open valves slowly: Avoid rapidly opening or closing suction and return valves while the pump is running.
• Inspect check valves: Check for noisy or slamming check valves on the return line. Replace with spring-loaded or soft-seat models designed to reduce hammer.
• Consider water hammer arrestors: In severe cases, have a plumber install water hammer arrestors or air chambers in the plumbing system.