This DIY repair guide explains how to replace the rotor position switch in a water softener. The rotor position switch tells the timer what position the rotor is in, so the timer knows when to start the motor that turns the valve rotor through cycles. If the position switch breaks, the motor runs constantly. Replace a broken rotor position switch with the manufacturer-approved replacement part.
Use these steps to replace the rotor position switch in Kenmore, GE and Whirlpool water softeners.
Replacing a water softener rotor position switch video.
Disconnect electrical power
Unplug the water softener to disconnect power.
Remove the top cover
Open the lid and release the 2 front clips on the cover.
Lift the front of the cover up and push it back to release the rear tabs.
Pull the top cover off.
Open the lid.
Release the front clips.
Remove the top cover.
Remove the valve motor
Remove the valve motor mounting screws and lift the valve motor off of the rotor.
Remove the valve motor screws.
Lift off the valve motor.
Remove the rotor position switch
Remove the plastic cover.
Lift the rotor position switch off of the mounting pins.
Disconnect the wires.
Remove the rotor position switch.
Lift off the plastic rotor cover.
Lift the switch off the mounting pins.
Disconnect the switch wires.
Install the new rotor position switch
Connect the wires to the new rotor position switch.
Push the new rotor position switch onto the mounting pins and reinstall the plastic cover.
Connect the switch wires.
Install the new switch.
Reinstall the valve motor
Position the valve motor and screw it into place.
Reinstall the valve motor.
Reinstall the top cover
Position the back of the top cover into the rear tabs and then push the front of the top cover down into the front locking clips.
Close the lid.
Reinstall the top cover.
Plug in the power cord.
The rotor position switch detects the position of the valve rotor. If the rotor position switch fails, follow these steps to replace it in about half an hour.
The venturi draws brine water from the salt tank to the resin tank for regeneration. Follow these steps to replace a damaged venturi.
Learn how to decipher symbols so you can buy the right part for your problem.
Find answers to some of the most commonly asked questions about water softener repairs.