Autotrol Microswitch for Logix Series Valves only, Top Plate Mount p/n 1239754

This microswitch mounts under the top plate of Autotrol Logix series control valves and signals the electronic control board when the drive cam or piston has reached its home position during a regeneration cycle. It's a small but essential part; if it fails or falls out of adjustment, the Logix timer loses track of where the valve is in its cycle, and the softener or filter won't complete regeneration correctly. WrekinWater stocks this microswitch, p/n 1239754, for servicing Logix-controlled valves.

Technical specifications

Symptoms that mean you need this part

• The valve motor runs continuously and never appears to find its home position
• The control display shows an error code relating to drive position or a stalled regeneration
• The valve hangs partway through a regeneration cycle and won't advance to the next stage
• The valve fails to return to the service position after completing a regeneration

Why it fails / why it matters

Logix control boards rely on the top plate microswitch to confirm when the internal cam or piston reaches its reference position, which is how the timer keeps the mechanical cycle and the electronic control in step with each other. When the switch contacts wear, the actuating lever bends, or the switch fails electrically, the board stops receiving that position signal and either hunts endlessly for home or throws an error and stops mid-cycle. Replacing the microswitch restores accurate position sensing so the valve completes its cycle and returns to service reliably.

Why buy this from WrekinWater

WrekinWater has supplied genuine-spec Autotrol control parts to installers and DIY customers for over 15 years from its Bettisfield, Shropshire base, stocking the Pentair Fleck, Autotrol, Clack and Kinetico ranges so the exact component can be matched rather than guessed. Having served more than 50,000 customers and holding an Excellent rating on Trustpilot, WrekinWater is set up to get a small but critical part like this to you quickly.

How to fit it

1. Isolate the electrical supply to the control valve before opening any covers
2. Remove the top plate cover to access the microswitch mounting
3. Note the orientation and wiring of the existing microswitch, then disconnect its connector
4. Unclip the faulty microswitch from its top plate mount and remove it
5. Fit the replacement microswitch p/n 1239754 in the same orientation and reconnect the wiring
6. Refit the top plate cover, restore power, and run a manual regeneration cycle to confirm the valve now finds home position correctly