Sump pump not turning on

Symptoms

• Water level in the sump pit rising without the pump activating
• Pump silent even as water reaches or exceeds the normal trigger level
• No hum or motor sound when the float is lifted

Likely causes

• CommonUnplugged or tripped power to the pumpThe outlet may be on a GFCI circuit that tripped, or the cord may have come loose.
• CommonStuck or tangled float switchThe float can get caught on the pit wall, cord, or debris and fail to rise with the water.
• PossibleJammed or seized impellerDebris or sediment in the pit can jam the pump's internal mechanism.
• PossiblePump motor failureMotors wear out over years of use, especially with age or lack of maintenance.

What to do

1. Check that the pump is plugged in and the outlet has power; reset a tripped GFCI outlet if that's the case.
2. Lift the float switch by hand to see if the pump activates; if it does, the float is likely tangled or positioned wrong.
3. Clear any debris in the pit that could be blocking the float's movement.
4. Pour a bucket of water into the pit to test whether the pump kicks on and actually removes the water.
5. Listen for a humming sound with no water movement, which can indicate a jammed or failed impeller.
6. Test the backup battery system if you have one, since it should take over during a power outage.
7. Replace the pump if it doesn't respond to any of these checks, since sump pumps typically last 7–10 years.

Tools and parts

• Bucket
• Flashlight

When to call a pro

Call a plumber for pump replacement or if you suspect a wiring issue with the outlet or circuit.

Safety