Product Overview

The Pentair Replacement IntelliChlor Plus and LT Sensor Board | 523769 is a genuine Pentair replacement sensor module designed for the latest generation IntelliChlor LT and IntelliChlor PLUS Salt Chlorine Generators.

This modular 3-in-1 sensor assembly monitors three critical operating conditions within the IntelliChlor system:

• Water flow
• Water temperature
• Conductivity / salinity

Instead of replacing the complete salt chlorine generator when a sensor module fails, the 523769 allows the sensor assembly to be serviced independently, helping reduce repair time and replacement cost.

Key Features

• Genuine Pentair OEM replacement part
• Manufacturer Part Number: 523769
• Replacement sensor module for IntelliChlor PLUS and LT
• Compatible with all current IntelliChlor LT and PLUS models
• 3-in-1 sensor module
• Monitors water flow
• Monitors water temperature
• Measures conductivity for salt-level determination
• Modular replaceable design
• Designed for faster field servicing
• Pentair states salinity measurement is approximately 98% as accurate as a laboratory-grade salinity meter
• Replacement O-ring included
• Six Torx mounting screws included
• Torx installation bit included
• No need to replace the complete cell solely because of a replaceable sensor-module failure
• Genuine factory replacement for compatible IntelliChlor systems

Compatibility

The Pentair 523769 Sensor Module Kit is designed for the current IntelliChlor LT and PLUS product family, including:

• IntelliChlor LT15
• IntelliChlor LT25
• IntelliChlor PLUS30
• IntelliChlor PLUS40
• IntelliChlor PLUS60

It is also used with compatible IntelliChlor LT/PLUS equipment bundles containing these salt chlorine generator models.

Always verify the salt chlorine generator model before ordering. The 523769 is specifically designed for the newer IntelliChlor LT / PLUS generation.

Specifications

3-in-1 Sensor Module

The 523769 combines three important IntelliChlor sensing functions into a single serviceable module.

Flow Sensor

Monitors water movement through the salt chlorine generator. Proper flow must be detected before the system can safely produce chlorine.

Temperature Sensor

Monitors water temperature so the IntelliChlor system can properly manage operation based on current water conditions.

Conductivity / Salinity Sensor

Measures water conductivity to determine the approximate salt concentration in the pool.

Pentair states that the sensor module's salinity measurement is approximately 98% as accurate as a laboratory-grade salinity meter under its testing conditions.

Common Symptoms of a Failed Sensor Module

A replacement sensor module may be required when a compatible IntelliChlor LT or PLUS system displays conditions such as:

• SENS ERR
• Incorrect or zero salt reading
• Unexpected WAITING FLOW message
• Incorrect temperature readings
• Flow-detection problems
• Salt-level readings that remain inaccurate after confirming actual water chemistry

Proper troubleshooting should be performed before replacing the sensor module because similar warnings can also result from actual low flow, incorrect salt concentration, wiring issues, or other system conditions.

Pentair SENS ERR Service Information

Pentair has identified 523769 as the replacement sensor module to use when an affected IntelliChlor LT or PLUS unit has a confirmed sensor-module issue associated with a SENS ERR warning.

In some cases, sensor-module problems may also produce:

• A 0 PPM salinity reading
• WAITING FLOW indications
• Inconsistent sensor readings

The replaceable-module design allows the sensor pack to be serviced without automatically replacing the complete chlorine generator.

What's Included

The Pentair 523769 Sensor Module Replacement Kit includes:

• IntelliChlor LT / PLUS sensor module
• Sensor-module O-ring
• Six Torx mounting screws
• Torx screw bit

Replacement Parts Reference

Installation Notes

Before servicing the IntelliChlor sensor module:

• Disconnect power to the salt chlorine generator and associated equipment.
• Shut down the circulation system.
• Relieve plumbing pressure.
• Verify that part 523769 matches the installed IntelliChlor model.
• Inspect the sensor-module mounting area and sealing surface.
• Always install the supplied replacement O-ring.
• Use the supplied Torx screws and installation bit.
• Do not overtighten the mounting hardware.
• Restore circulation and verify flow, temperature, and salt readings after installation.

Professional installation is recommended when the cause of the sensor error has not been confirmed.

Frequently Asked Questions

What does Pentair 523769 replace?

It replaces the sensor module on compatible IntelliChlor LT and IntelliChlor PLUS salt chlorine generators.

Which sensors are built into the 523769?

The module combines:

• Flow sensing
• Temperature sensing
• Conductivity / salinity sensing

Does 523769 fit the IntelliChlor PLUS30?

Yes. It is compatible with the PLUS30, as well as PLUS40 and PLUS60.

Does it fit the IntelliChlor LT15 and LT25?

Yes. Both LT15 and LT25 use the 523769 sensor module.

Does the kit include the O-ring?

Yes. A replacement sensor-module O-ring is included.

Are the screws included?

Yes. The kit includes six Torx screws and a Torx screw bit.

Will this fix a SENS ERR message?

A confirmed sensor-module fault displaying SENS ERR can require replacement with part 523769. Other system conditions should be ruled out before replacing parts.

Do I have to replace the complete IntelliChlor cell when the sensor fails?

Not necessarily. One of the advantages of the newer IntelliChlor PLUS and LT design is that the sensor module can be replaced independently.