Sump Pump Not Working? Common Causes to Check

Check the Power Supply First

Before assuming the pump itself has failed, confirm it is actually receiving power. A tripped breaker, an unplugged cord, or a tripped GFCI outlet are simple, common causes that are easy to overlook when a pump suddenly seems dead.

A Stuck or Jammed Float Switch

The float switch is what tells the pump to turn on as water rises in the pit. If it gets stuck against the side of the pit or tangled, it may not trigger the pump even though water is present. Checking that the float can move freely is worth doing before assuming a bigger problem, but unplug the pump first, and do not reach into the pit or touch cords or outlets if there is standing water nearby.

A Clogged Intake or Discharge Line

Debris, sediment, or small objects can block the pump intake or the discharge line leading outside, causing the pump to run without actually moving water, or to shut off due to strain. This is a common issue in pits that are not checked or cleaned periodically.

A Worn-Out Motor

If the pump has power, the float moves freely, and nothing is visibly blocked but it still is not working, the motor itself may have failed, particularly if the unit is older or has cycled frequently over the years. At this point it is usually a repair or replacement decision best made with a provider.

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