How to Check if a Sump Pump Works
There are two ways you can check that your sump pump is working correctly.
1) Find the sump pump in your basement or mechanical room. Trace the two electrical cords from the sump pump to the electrical outlet. The pump cord plugs into the back of the float cord plug. Pull the plugs from the outlet, pull the plugs apart, and plug the pump cord only back into the outlet. You should hear the pump running. Unplug the pump and plug the cords back in the wall with the float first, and the pump cord plugged into the back of the float pump.
2) Remove the lid from the sump basin. Pour about 5 gallons of water from a bucket into the basin. You only need enough water to raise the float until the pump kicks on. The pump should turn on and begin to pump water from the basin. Wait until the water pumps from the crock to ensure the pump turns itself off, then slowly pour the remaining water in the basin to ensure the pump turns on again.
If the pump doesn't turn on immediately, your pump needs to be repaired or replaced, so you should call a licensed plumber. If the pump worked properly, don't forget to reconnect the other plug.