A sump pump runs constantly when its float switch is stuck in the on position, the check valve is letting water flow back into the pit, groundwater is very high after heavy rain, the pump is too small for the amount of water, or the discharge line is blocked. Constant running wears out the motor, so it is worth finding the cause.
A Stuck Float
The float tells the pump when to start and stop. If it gets caught on the side of the pit, the power cord, or debris, it can stay up even when the pit is empty. The pump then keeps running without moving much water. Unplug the pump before checking that the float moves freely.
A Failing Check Valve
The check valve on the discharge pipe stops water from falling back into the pit after the pump shuts off. When it fails, the same water cycles in and out. You may hear the pump start again just seconds after stopping.
Heavy Rain and High Groundwater
After a big storm, water can keep flowing into the pit for hours or even days. Constant running during heavy rain can be completely normal for a while. If it continues long after the weather clears, something else may be wrong.
Pump Size and Discharge Problems
A pump that is too small for the water coming in may run nonstop and still fall behind. A discharge line that is clogged, crushed, or frozen keeps water from leaving, so the pump keeps working without getting results.
Running nonstop shortens a pump’s life. If yours rarely rests, a plumber can find out why it never shuts off before the next storm. A pump that works this hard is a good reason to have other basement water issues reviewed. Call JPR Plumbing at (833) 603-1840.