The short answer
Check the Power Source
Start with the basics. Look at the circuit breaker and the GFCI outlet that powers your sump pump. A tripped breaker or a blown fuse can stop the pump completely. Reset the breaker or press the reset button on the GFCI outlet if needed.
If the pump is plugged into an outlet, make sure the plug is fully inserted. A loose connection can cause intermittent power loss. You can also test the outlet with a lamp or phone charger to confirm it has power. If the outlet works, the problem lies elsewhere.
- Check the breaker panel for a tripped switch
- Press the reset button on the GFCI outlet
- Ensure the power cord is firmly plugged in
- Test the outlet with another device
- Look for a battery backup and check its charge
Inspect the Float Switch
The float switch tells the pump when to turn on. If it is stuck, the pump may not activate. Look inside the sump pit for the float. It can get tangled in cords or jammed against the side of the pit. Gently move it to see if it moves freely.
Some floats are tethered, meaning they hang on a rod. Others are vertical. If the float is stuck in the down position, the pump will not start. Clean any debris around the float and ensure it has room to move. If the float is damaged, the pros may need to replace it.
- Look for tangles or obstructions around the float
- Move the float by hand to test its range
- Clean away dirt and debris from the float
- Check if the float is cracked or waterlogged
- Test the pump manually by lifting the float
Look for Clogs or Blockages
A clogged intake or discharge line can prevent the pump from turning on. Debris like gravel, sand, or roots can block the pump's inlet. If the pump cannot draw water, it may not activate. Inspect the pit for buildup and remove any visible debris.
Check the discharge pipe for kinks or blockages. If the pipe is frozen or blocked, the pump may shut off to protect itself. You can try clearing it with a plumber's snake or a hose. If you cannot clear the blockage, a plumber may need to help.
- Remove debris from the sump pit
- Check the discharge pipe for kinks
- Look for ice or blockages in the line
- Flush the line with water to clear it
- Inspect the pump's inlet screen for clogs
Test the Pump Manually
Most sump pumps have a manual test mode. Look for a small lever or switch on the pump or the float. Lift the float manually or press the test button to see if the pump runs. If it runs, the pump itself is fine, and the issue is likely the float or power.
If the pump does not run even when you lift the float, the motor may be burned out. You can also check the pump's impeller for debris. If the pump is old or worn, it might be time for a replacement. The pros can inspect and advise on the right course.
- Locate the test lever or button on your pump
- Lift the float to see if the pump activates
- Listen for a humming sound, which indicates power
- If humming but not pumping, the impeller may be stuck
- If no sound at all, the motor may be dead
When to Call the Pros
If you cannot find the cause, or if the pump still will not turn on after basic checks, it is time to call local water damage pros. They have tools to test the pump, wiring, and water level sensors. They can also check for hidden issues like a broken check valve or a faulty switch.
If water is already rising in your basement, act quickly. Standing water can damage walls, floors, and belongings. The pros can also handle emergency sump pump installation and repair if a replacement is needed. They can also help with water damage cleanup if flooding has already occurred.
Policies vary, and your insurer decides what is covered.
- Call a plumber for clogged discharge lines
- Hire the pros for pump replacement or electrical issues
- If water has flooded, contact water damage pros
- Keep your shutoff valve location written down if you live in Redmond
Talk to someone now
Call (425) 407-5186 any time, day or night, and describe what happened.
Call Now (425) 407-5186Frequently asked questions
Why does my sump pump hum but not turn on?
A humming sound usually means power is reaching the pump, but the impeller is stuck. Debris or a seized bearing can cause this. Turn off the power, clean the pump, and try again. If it still hums, the motor may need replacement.
Can I fix a sump pump float myself?
You can try cleaning or repositioning the float. If it is cracked or waterlogged, it will not work and needs replacement. That is a straightforward job for a homeowner with basic skills. If you are unsure, the pros can handle it.
How often should a sump pump be tested?
Test your sump pump every few months, especially before the wet season. Pour water into the pit to see if the pump activates. Regular testing helps catch problems early. In wet winters, a working pump is important for your basement.