Product Overview

The Pentair Keypad RS-485 Adapter 355862 is a replacement communication component designed for compatible Pentair IntelliFlo and IntelliPro variable-speed pool pumps.

This adapter supports communication between the pump’s keypad assembly and electronic drive. It is commonly used when repairing a damaged, corroded, missing, or noncommunicating keypad connection.

A failed RS-485 adapter may prevent the keypad from communicating properly with the pump drive, resulting in an unresponsive display, communication problems, or an inability to access pump programming. Because similar symptoms may also be caused by a failed keypad, damaged wiring, drive failure, or loss of electrical power, proper diagnosis is recommended before replacing this component.

Key Features

• Replacement RS-485 keypad adapter
• Designed for select Pentair IntelliFlo and IntelliPro pumps
• Supports communication between the keypad and pump drive
• Helps restore keypad control and programming access
• Compact replacement electronic component
• Suitable for pump drive and keypad repairs
• Genuine Pentair replacement part
• Professional installation recommended

Specifications

Compatible Pump Families

The Pentair 355862 adapter is intended for select pumps within the following product families:

• Pentair IntelliFlo variable-speed pumps
• Pentair IntelliPro variable-speed pumps

Pentair has produced several generations of IntelliFlo and IntelliPro pumps. Compatibility can vary according to the pump model, serial number, production date, keypad style, and drive configuration.

The complete pump model and original adapter should be inspected before ordering.

How the RS-485 Adapter Works

The RS-485 adapter provides a communication connection between the keypad and the electronic pump drive. This allows commands and operating information to be transferred between the two components.

Depending on the pump configuration, the keypad may be used to access:

• Pump speeds
• Operating schedules
• Start and stop controls
• Priming settings
• Freeze-protection settings
• Diagnostic messages
• Pump status information
• Automation-related settings

Replacing the adapter may restore communication when the original component has been damaged or has developed a poor connection.

Common Reasons for Replacement

The adapter may require replacement when experiencing:

• Keypad does not communicate with the drive
• Display remains blank or unresponsive
• Keypad intermittently disconnects
• Pump controls do not respond
• Visible corrosion on the adapter
• Damaged connector or communication pins
• Moisture intrusion near the keypad connection
• Adapter is missing during a keypad or drive repair
• Pump displays a communication-related fault

These symptoms do not always confirm adapter failure. The keypad, electronic drive, communication cable, wiring connections, and incoming power should also be inspected.

Confirm Before Ordering

• Verify the pump’s complete model number.
• Confirm the pump is within a compatible IntelliFlo or IntelliPro generation.
• Compare the existing adapter with part number 355862.
• Inspect the connector style and pin configuration.
• Check the original component for corrosion or moisture damage.
• Confirm whether the problem is with the adapter, keypad, wiring, or complete drive.
• Do not order based only on the IntelliFlo or IntelliPro product name.
• Disconnect electrical power before servicing the pump.
• Installation should be completed by a qualified pool-equipment technician.

Installation Information

Turn off and lock out electrical power to the pump before removing the keypad or opening the drive assembly. Variable-speed pumps contain high-voltage electrical components that can cause serious injury.

During installation, inspect:

• Keypad connector
• RS-485 communication wiring
• Adapter pins and terminals
• Drive housing
• Gaskets and seals
• Evidence of moisture intrusion
• Corrosion or burned components
• Keypad and drive compatibility

After installation, restore power and test the keypad controls, display, pump programming, schedules, and communication functions.

Do not force connectors into place or alter the adapter wiring.

Warranty Information

This genuine Pentair replacement component is covered according to Pentair’s applicable replacement-parts warranty terms.

Warranty eligibility may depend on:

• Correct pump compatibility
• Professional installation
• Proper electrical supply
• Proof of purchase
• Compliance with Pentair service procedures

Damage caused by incorrect installation, incompatible equipment, electrical surges, water intrusion, corrosion, damaged wiring, or unauthorized modifications may not be covered.

Customer-Facing Q&A

What does this adapter do?
The 355862 adapter supports RS-485 communication between the pump keypad and the electronic drive on compatible IntelliFlo and IntelliPro pumps.

Does this listing include the complete keypad?
No. This listing is for the RS-485 keypad adapter only, unless otherwise stated.

Does it include the complete pump drive?
No. The electronic drive, motor, wet end, and complete pump are not included.

Will this fix a blank keypad display?
It may correct a communication problem caused by a damaged adapter. However, a blank display may also be caused by a failed keypad, drive problem, damaged wiring, moisture intrusion, or loss of power.

Does it fit every IntelliFlo and IntelliPro pump?
No. Pentair has manufactured several pump generations with different keypads and drive assemblies. Compatibility must be confirmed before ordering.

Is professional installation recommended?
Yes. Electrical power must be disconnected before servicing a variable-speed pump, and proper diagnosis is recommended before replacing electronic components.