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Pentair Autotrol 255 Series - User Manual

Pentair Autotrol 255 Series
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AUTOTROL
®
255 VALVE/400 SERIES CONTROLS
SERVICE manual
www.pentairaqua.com

Table of Contents

Questions and Answers

  • G
    georgerogersAug 17, 2025
    Why is my Pentair Control Unit not drawing brine?
    • Y
      yrayAug 17, 2025
      If your Pentair Control Unit isn't drawing brine, it could be due to several reasons. Check for low water pressure and adjust the settings as per the instructions. Also, inspect the drain line for any restrictions and remove them. The injector might be plugged, so clean the injector and screen. If the injector is defective, consider replacing the injector and cap. Additionally, ensure valve discs 2 and/or 3 are closing properly by removing any foreign matter and checking the disc closure; replace if needed. Lastly, the air check valve might be closing prematurely; momentarily put the control into brine refill and replace or repair the air check if necessary.
  • E
    Elizabeth TorresAug 20, 2025
    What to do if Pentair Autotrol 255 runs out of soft water between regenerations?
    • A
      Alyssa FernandezAug 20, 2025
      If your Pentair Control Unit is running out of soft water between regenerations, it could be due to several reasons. Start by repeating the regeneration, ensuring that the correct salt dosage is used. Also, verify that the salt control is set to the proper level, referring to the salt setting chart. Confirm that the hardness and capacity settings are correct, consulting the Programming section. If the water hardness has increased, adjust the hardness or days to the new value, as described in the Programming section. Finally, check for restricted meter turbine rotation due to foreign material; remove the meter housing, free up the turbine, and flush with clean water. If the turbine doesn't spin freely, replace the meter.
  • B
    Bryce GrahamAug 22, 2025
    How to stop brine tank overflow in Pentair Control Unit?
    • W
      Whitney ParkerAug 22, 2025
      If the brine tank is overflowing in your Pentair Control Unit, it may be due to an uncontrolled brine refill flow rate. Remove the brine control to clean the ball and seat. Also, check all connections in the brine line for leaks, referring to the instructions. Another potential cause is a drain control clogged with resin or other debris; in this case, clean the drain control.
  • J
    Jonathan RayAug 25, 2025
    Why is Pentair Autotrol 255 using more salt than setting?
    • J
      Jennifer GoldenAug 26, 2025
      If your Pentair Control Unit system is using more or less salt than the regenerant setting indicates, there might be foreign matter in the controller causing incorrect flow rates. To resolve this, remove the brine control and flush out any foreign matter. Manually position the control to brine/slow rinse to clean the controller, and then position the control to "purge” to remove brine from the tank.
  • P
    pmontesAug 27, 2025
    What to do if Pentair Autotrol 255 Control Unit drips water after regeneration?
    • C
      Chad FoxAug 27, 2025
      If you notice flowing or dripping water at the drain or brine line after regeneration with your Pentair Control Unit, it could be that the valve stem return spring is weak. In this case, replace the spring.
  • J
    Jenna ArnoldAug 30, 2025
    Why is Pentair Control Unit leaking hard water after regeneration?
    • J
      Jay BauerAug 30, 2025
      If you experience hard water leakage after regeneration with your Pentair Control Unit, it could be due to a few reasons. First, try repeating the regeneration after ensuring the correct salt dosage was set. Another cause might be a leaking external bypass valve; in this case, replace the bypass valve. Lastly, a damaged O-ring around the riser pipe could be the culprit; replace the O-ring.
  • V
    Veronica WintersSep 2, 2025
    Why is brine draw intermittent in Pentair Control Unit?
    • V
      Virginia JohnsonSep 2, 2025
      If you are experiencing intermittent or irregular brine draw with your Pentair Control Unit, it could be due to low water pressure. Set the pump to maintain 20 psi at the softener. Another potential cause is a defective injector; replace the injector.
  • J
    Jeffrey GoodwinSep 5, 2025
    What to do if Pentair Autotrol 255 Control Unit has no soft water after regeneration?
    • J
      Jaclyn HernandezSep 5, 2025
      If you have no conditioned water after regeneration with your Pentair Control Unit, it could be due to a few reasons. First, check if there is salt in the brine tank and add salt if necessary. Another cause could be a plugged injector; clean the injector and screen. Lastly, the air check valve might be closing prematurely; put the control momentarily into brine/slow rinse and replace or repair the air check if needed.
  • P
    patriciacontrerasSep 7, 2025
    Why does Pentair Autotrol 255 Control Unit backwash at wrong rate?
    • W
      William EwingSep 8, 2025
      If the Pentair Control Unit backwashes or purges at an excessively low or high rate, it could be due to an incorrect drain controller being used; replace it with the correct size controller. Alternatively, foreign matter might be affecting the controller's operation; remove the drain controller and clean the ball and seat.
  • R
    rachel17Sep 12, 2025
    What to do if Pentair Autotrol 255 Control Unit has no water flow display?
    • W
      watsondebraSep 12, 2025
      If there is no water flow display when water is flowing in your Pentair Control Unit, it could be due to several reasons. Check if the bypass valve is in the bypass position and shift it to the not-in-bypass position. Ensure the meter probe is fully inserted into the meter housing. Also, check for restricted meter turbine rotation due to foreign material; remove the meter housing, free up the turbine, and flush with clean water. The turbine should spin freely; if not, replace the meter. Finally, the meter probe might be defective; replace the meter cable.

Summary

AUTOTROL 255 VALVE;400 SERIES CONTROLS SERVICE MANUAL

SAFETY INFORMATION

Electrical Safety

User-serviceable parts, connections, adapter, and grounding requirements.

Mechanical Safety

Lubricant types, connection tightening, soldering, and solder types.

General Safety Precautions

Tank orientation, temperature limits, pressure, salt type, water quality, and tank filling.

EQUIPMENT INSTALLATION

Location Selection

Water Line Connection

Drain Line Connection

SYSTEM STARTUP

Initial Startup Procedure

Step-by-step guide to place the conditioner into operation after installation.

PROGRAMMING

460 i Control Programming

Setting regeneration days, time of day, hardness, capacity, and calendar override.

Hardness Setting

Capacity Setting

460 TC Control Programming

Setting time of day, days between regeneration, and clock format.

Salt Dial Adjustment

Days Setting

SERVICE AND MAINTENANCE

Injector Cleaning and Maintenance

Disinfection of Water Conditioners

TROUBLESHOOTING

Valve Troubleshooting

Common problems related to the valve and their solutions.

255;440 i Troubleshooting

Specific troubleshooting for 255/440i control issues.

255;460 i;460 TC Troubleshooting

Specific troubleshooting for 255/460i/460TC control issues.

Pentair Autotrol 255 Series Specifications

General IconGeneral
BrandPentair
ModelAutotrol 255 Series
CategoryControl Unit
LanguageEnglish

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