How to Replace a Sump Pump Float Switch


Read your manual for installation, operation, and safety information. This guide neither supplements nor replaces the Owner’s Manual.

How to Replace a Sump Pump Float Switch
The sump pump float switch is a vital part of your sump pump, but due to lack of care, or debris floating into the sump basin, this switch may be fouled. Replacing it is not easy, as if it is not done correctly, and with the right parts, you may find that the pump will not work, or is no longer sealed. You can replace the sump pump float switch at home, but a professional can be called if needed.

Cost (0-5 scale): 2
Difficulty (0-5 scale): 2

Items Needed:
• Screwdriver
• Glue
• Concrete sealing
• Replacement Switch

Step One - Opening up the Switch
Once you have your switch out of the sump pump, unscrew the connections, and open it up. You should be able to see the small electric switch inside it. Remove the old switch, and glue in the replacement using waterproof glue. Leave this to dry, and then replace in the sump pump and test.

Step Two - Add a Different Switch
If you don't want to bother with the sump pump’s float switch, then you should consider using an external float switch equipped with a piggyback plug. Follow the installation instructions supplied with the replacement switch. Installation will follow steps similar to these:
• Bypass the original pump switch circuit and seal the electrical housing thoroughly using silicone sealant.
• Using a zip tie, loosely attach the replacement switch to the pump housing.
• Plug the switch into the outlet, then the bypass plug into the switch.
• Fill the basin with water and adjust the replacement switch attachment point so that the pump turns on at the appropriate basin water level. Tighten the zip tie to secure switch in place.