The short answer
Power Outages
Storms often knock out electricity, and a sump pump that depends on household power stops working the moment the lights go out. Without power, water keeps entering the sump pit and can overflow onto your floor. A backup battery system or a generator can keep the pump running during an outage.
Check your pump's battery backup before storm season. Batteries lose charge over time, so test them regularly. A charged backup is a practical step for any home that faces heavy rain. Also, know where your main electrical panel is so you can reset a tripped breaker quickly.
Stuck Float Switch
The float switch tells the pump when to turn on and off. If it gets stuck in the down position, the pump never activates, and water rises unnoticed. Debris, mineral buildup, or a misaligned float arm can cause this. Before a storm, lift the float manually to confirm it moves freely and triggers the pump.
Sometimes the float gets caught on the pump's power cord or the discharge pipe. Make sure the float has a clear path to move. If you notice the pump cycling on and off too frequently, the float may be set too high or too low. Adjust it so the pump turns on before water reaches the top of the pit.
Clogged Intake or Discharge
Sump pumps move water, but they can choke on debris. Leaves, mud, or small objects can block the intake screen, reducing water flow or stopping the pump entirely. The discharge pipe, which carries water away from your home, can also clog with silt or roots. A clogged discharge forces the pump to work harder and can burn out the motor.
Inspect the pump and pit before a storm. Remove any debris from the pit and clean the intake screen. Check the discharge pipe for obstructions, especially where it exits your home. If you have a check valve on the discharge line, make sure it opens and closes properly, because a stuck check valve can cause the pump to short-cycle.
- Unplug the pump before cleaning
- Wear gloves and eye protection
- Use a garden hose to flush the pit
- Check the discharge line for kinks
- Test the pump by pouring water into the pit
- Replace worn float switches promptly
Overheating and Motor Burnout
During a heavy storm, a sump pump may run continuously for hours. That constant operation can overheat the motor, especially if the pump is undersized for the water volume. Overheating can trip a thermal overload switch, which shuts the pump down until it cools, but repeated overheating can permanently damage the motor.
If your pump runs nonstop during every heavy rain, it may be too small for your sump pit. A larger pump or a second pump can handle the load. Also, ensure the pump is not running dry; a pump that runs without water can overheat quickly. If you suspect motor damage, have a professional inspect the pump before the next storm.
When to Call a Pro
Some sump pump problems are simple to fix, but others require a professional. If you have water in your lower level after a storm, the first step is to remove the water safely. Turn off the power to the area if water is near electrical outlets. Then, dry out the space to prevent mold growth.
A water damage inspection can identify hidden moisture in walls and floors. If the flooding has affected drywall, flooring, or personal belongings, you may need professional cleanup. Local water damage pros can handle the drying, cleaning, and repairs. They can also advise on preventing future pump failures.
- Check for standing water in the pit
- Listen for unusual noises from the pump
- Look for rust or corrosion on the pump
- Test the pump manually before a storm
- Keep a spare float switch on hand
- Schedule a yearly pump inspection
Need help right now?
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (480) 898-4279Frequently asked questions
How can I test my sump pump before a storm?
Pour a bucket of water into the sump pit and watch the float rise. The pump should turn on and drain the water. Also, unplug the pump and plug it back in to test the power connection. Do this monthly, especially before the rainy season.
What should I do if my sump pump stops working during a storm?
First, check the power source and reset the breaker if needed. Then, manually lift the float to see if the pump activates. If it still doesn't work, unplug it and remove any debris. If water is rising, move valuables to higher ground and call a professional for help.
Can a sump pump be repaired, or do I need a new one?
Minor issues like a stuck float or clogged intake are often repairable. But if the motor is burned out or the pump is old, replacement may be more practical. A professional can assess the pump's condition and recommend the right option.