How to Troubleshoot a Sump Pump Diaphragm Switch

A sump pump diaphragm switch is a pressure-sensitive switch that turns the sump pump on when the water level in the sump basin rises to a certain point and turns it off when the water level drops to a lower point. If your sump pump is not working properly, the diaphragm switch may be the culprit. Here are some tips on how to troubleshoot a sump pump diaphragm switch:

- Check the power supply. Make sure that the sump pump is plugged in and that the power is turned on.

- Check the float switch. The float switch is a plastic ball or cylinder that floats on the water in the sump basin. When the water level rises, the float switch rises with it and activates the diaphragm switch. Make sure that the float switch is not stuck or obstructed.

- Check the diaphragm switch. The diaphragm switch is a small, round device that is mounted on the side of the sump pump. When the water level rises, the pressure on the diaphragm switch increases and causes the switch to activate. Make sure that the diaphragm switch is not damaged or clogged.

- Test the sump pump. To test the sump pump, pour a bucket of water into the sump basin. The sump pump should turn on and pump the water out of the basin.

If you have followed these steps and the sump pump is still not working properly, you may need to replace the diaphragm switch. Diaphragm switches are relatively inexpensive and easy to replace. You can find them at most hardware stores.