The Autotrol 255-740 is a complete Logix timed control valve assembly for water softeners, supplied with transformer as a full replacement unit for the softener's control head, and stocked by WrekinWater. It initiates regeneration on a fixed time-clock schedule rather than metering actual water use, making it the standard control valve fitted to countless domestic and light commercial softeners built around the Autotrol 255 platform. This is the part to order when the existing valve body, piston or electronics have failed beyond economical repair and the whole control head needs swapping out.
Technical specifications
| OEM Part Number | 255-740 |
| Control Type | Logix timed (time-clock) regeneration |
| Includes | Control valve body, Logix timer electronics, transformer |
| Excludes | Top screen/display bezel (sold separately) |
| Compatible With | Autotrol 255-series water softeners using timed regeneration |
| Regeneration Trigger | Fixed schedule, independent of water usage |
| Brand | Autotrol |
Symptoms that mean you need this part
- The existing 255 valve has failed electronically and individual circuit boards or timers are no longer available
- The valve body is cracked, badly scored or leaking internally despite repeated seal and spacer kit replacements
- The softener has had multiple part failures in succession and is no longer economical to keep repairing piece by piece
- You're upgrading an obsolete or discontinued control head and need a direct-fit timed replacement valve
Why it fails / why it matters
A timed Autotrol 255 valve regenerates on a preset schedule using an internal timer and drive motor to rotate the piston through backwash, brine draw, rinse and refill, rather than tracking actual water consumption. When the valve body wears, the timer electronics fail, or the piston and seal stack have degraded to the point where individual spares no longer restore reliable operation, replacing the whole control head is the only sensible option rather than chasing a string of smaller failures. The 255-740 gives you a complete, ready-wired unit that drops onto the existing softener tank and bypass without needing to source and match individual internal components.
Why buy this from WrekinWater
WrekinWater has supplied Autotrol and Pentair Fleck control valves to installers and homeowners for over 15 years from its Bettisfield, Shropshire base, and as a stockist of the full Pentair Fleck, Autotrol, Clack and Kinetico ranges can confirm exact compatibility with your existing tank and bypass before you order. Backed by more than 50,000 customers served and an Excellent Trustpilot rating, WrekinWater is a reliable source for a part that takes your softener offline until it's fitted.
How to fit it
- Confirm the 255-740 is compatible with your existing softener tank, bypass valve and riser tube before ordering, checking part numbers or asking WrekinWater to confirm
- Isolate the softener at the bypass and relieve pressure before starting any work
- Have a competent installer or plumber disconnect the existing valve from the bypass, riser tube and drain/brine lines
- Fit the new 255-740 valve assembly onto the tank, aligning the riser tube and reconnecting the bypass, drain and brine lines
- Wire in the transformer and confirm the Logix timer is programmed with the correct regeneration schedule for your household or system
- Restore water supply gradually, check all connections for leaks, and run a manual regeneration cycle to confirm the new valve is operating correctly
Frequently Asked Questions
Unfortunately we are unable to accept returns on our Water Softener Parts So please confirm the correct part is ordered. If you have any doubt please feel free to call us prior to purchase for confirmation.
Autotrol 255-740 Logix Timed Replacement Valve -with Transformer - No Top Screen
