A sump pump float switch turns the pump on when water in the pit rises to a certain level and shuts it off once the water drops. It is the part that tells the pump when to work, so if it sticks or fails, the pump may not run when you need it.
Common Types of Float Switches
- Tethered float: a ball on a short cord that rises and tilts as water goes up. It needs room to swing in the pit.
- Vertical float: a float that slides up and down on a rod. It works well in narrow pits.
- Electronic sensor: no moving float. It senses water level and turns the pump on and off.
Signs a Float Switch Is Failing
A pump that will not turn on even though the pit is full, a pump that runs nonstop when the pit is empty, or a pump that turns on and off in quick bursts can all point to the float switch. A float that looks stuck against the side of the pit, tangled in the cord, or weighed down by debris is another clue.
Why Floats Get Stuck
Pumps can shift slightly in the pit over time, pushing the float against the wall. Silt, gravel, and debris can pile up and block movement. Cords and discharge pipes can get in the way. Floats also wear out with age.
Safe Ways to Check
From a dry spot, look into the pit and see whether the float can move freely. Test the pump by slowly pouring water into the pit and watching the float rise. Reaching into the pit is never safe while the pump has power. If the float looks stuck, have it adjusted or replaced by a professional.
When the switch fails, getting the pump and switch repaired before a storm protects your basement. For questions about your basement drainage setup, you can talk with a plumber about the pit and pump at (833) 603-1840.