Pentair Autotrol 263/268/278 Logix Series 1 piece Spring p/n 1235339

This one-piece spring, Pentair part number 1235339, is the genuine replacement for the Autotrol Logix series 263, 268 and 278 control valves. WrekinWater supplies it as a spare for the internal piston assembly, where it provides the tension needed to return the piston fully to its home position between regeneration stages. A tired or broken spring here is a common cause of a valve that cycles erratically.

Signs you need this part

• The valve fails to return fully to the service position after a regeneration.
• You hear a clunk or water hammer as the piston shifts between cycles.
• Regeneration seems to stall or hang partway through instead of completing.
• The piston feels slack or doesn't spring back when you push it by hand with the water off.

The piston in a Logix series valve relies on this spring to seat correctly and move cleanly between service, backwash, brine and rinse positions. As the spring loses tension or breaks with age, the piston can hang between positions or fail to seal properly against its spacers, which shows up as erratic cycling, unusual noises, or water bypassing the resin bed during what should be a normal regeneration.

WrekinWater, a family run business based in Bettisfield, Shropshire with an Excellent Trustpilot rating, stocks genuine Pentair Autotrol internal parts like this spring for customers maintaining their own softeners.

How to fit it

1. Turn off or bypass the water supply and press the button to release any trapped pressure.
2. Remove the back plate or motor to expose the piston assembly.
3. Slide out the piston and locate the old spring on the assembly.
4. Remove the worn or broken spring and fit the new one-piece spring in the same position.
5. Refit the piston, then the motor or back plate.
6. Restore the water supply and run a manual regeneration to confirm smooth, quiet cycling.