Pump hums but does not start; no water is moving.

Safety First: Unplug the pump before attempting any mechanical inspection. Do not push the motor to start by hand while powered.

• Access the impeller: Remove the pump strainer cover and basket. Look into the impeller area with a flashlight.
• Clear debris: Use a plastic tool or long zip tie to remove hair, string, or small stones from the impeller vanes.
• Check for free rotation: With the pump unplugged, gently rotate the impeller. If it is very stiff or locked, the bearings may be seized and the motor assembly will need replacement.
• Verify power: Plug the pump directly into a known-good outlet without an extension cord. Low voltage can prevent the motor from starting.
• Test run: Reassemble and prime the pump with water. If the motor still only hums, internal electrical components are likely faulty and the motor assembly should be replaced.