Diagnose & Fix Your Older Pentair Pool Pump: Motors & Drives Guide

Many Pentair pool pumps rely on both a motor and a drive to function properly. If your pump is experiencing issues—such as not turning on, making strange noises, or running inefficiently—this guide will help you diagnose the problem and find the right replacement parts.

Common Signs of Motor vs. Drive Failure

Motor Issues

✅ Won’t turn on at all

✅ Runs but overheats or shuts off

✅ Humming or buzzing sound, but impeller doesn’t spin

✅ Burning smell from the motor housing
 

Possible Fixes:

  • Inspect wiring connections
  • Check for blown capacitors
  • Test for voltage issues
  • Consider replacing the motor if seized or overheated

Drive (Controller) Issues

✅ Display panel not responding

✅ Speed settings not working

✅ Random shutdowns or erratic operation

✅ Error codes displayed

 

Possible Fixes:

  • Power cycle the pump (turn off and on)
  • Check for firmware updates (if applicable)
  • Inspect for loose or corroded connections
  • Replace the drive if the motor works when directly powered

Matching Motors & Drives for Older Pentair Pumps

Use this chart to find the correct drive and motor for your Pentair pool pump model.

Compatible Drive Kits

Compatible Motor

Compatible Pumps

Pentair Variable Speed Intellilflo Motor 350305S

TEFC Square Flange Motor

EV-011059, 011028, EC-011060, 011055, 011056, EC-022055, 023056, 011059, 011060, 022056


🛠️ Need a replacement? Shop available Pump Motors or search for Drive Kits

Step-by-Step Diagnosis Process

A.

Check the Power Supply
  • Ensure the breaker is ON and no GFCI reset is needed.
  • Measure voltage at the terminal connections.

B.

Test the Motor
  • Remove the drive and test direct power to the motor.
  • If the motor spins, the issue is likely the drive.
  • If the motor does not spin, it needs replacement.

C.

Inspect the Drive
  • Check for error codes or display malfunctions.
  • Look for water damage or corrosion.
  • If unresponsive, replace the drive.

Frequently Asked Questions

Can I replace just the drive without replacing the motor?

Yes, as long as the motor is still operational and compatible with the replacement drive.

How do I know if my motor is overheating?

If it feels extremely hot to the touch or shuts off unexpectedly, overheating is likely.

What is the lifespan of a Pentair motor and drive?

Most motors last 5-10 years, while drives may need replacement sooner, especially in harsh weather conditions.