Pool Pump Troubleshooting
Work through the most common pool pump failures step by step. No guessing, no fluff — find your problem and fix it.
What Is Your Pump Doing?
🔴 Won’t Turn On
🟡 Running Problems
🔵 Prime Issues
Troubleshoot by Part
⚙️ Motor
Humming, seized, overheating, won’t start, needs replacement
⚡ Capacitor
The #1 cause of a pump that hums but won’t spin — cheap to fix
🌀 Impeller
Clogged or cracked — causes low flow or no flow at all
💧 Shaft Seal & O-Rings
Most common source of leaks around the pump
🧺 Pump Basket
Cracked or clogged — causes prime and suction problems
🏠 Pump Housing
Cracked volute, air leaks, structural damage
Troubleshoot by Brand
Hayward
SuperPump, MaxFlo, EcoStar, TriStar — common failures and fixes
Pentair
WhisperFlo, IntelliFlo, SuperFlo VS — error codes and repairs
Jandy
ePump, FloPro, SteadyFlo — diagnosis and part replacement
Intex
Krystal Clear cartridge and sand filter pumps
Bestway
Flowclear above ground pump systems
Variable Speed
Programming, error codes, efficiency settings for VS pumps
💰 Repair vs. Replace
Air Bubbles in Returns
Bubbles from return jets mean a suction-side air leak. The shaving cream test finds it fast.
Booster Pump Problems
Polaris and cleaner booster pump issues — separate from your main circulation pump.
Spa/Hot Tub Pump Issues
No flow, noise, and FLO error codes on attached spa pumps.
Intex Pump Problems
Common fixes for Intex above-ground and inflatable pool pumps.
Timer Not Working
Mechanical tripper issues and digital timer programming fixes.
Salt Water Pump Issues
What’s different about pumps feeding a salt chlorine generator.
VS Pump Troubleshooting
Error codes, drive faults, and speed control issues.
Won’t Restart After Outage
GFCI tripped, surge fuse blown, or timer lost programming.
High Pressure
Filter pressure too high — backwash or clean fixes 60% of cases.
Vibrating Excessively
Loose mounting, chipped impeller, or bad bearings.
Burning Smell
Shut it off now. What each smell type means and what to do.
Wiring Guide
115V vs 230V configuration, GFCI requirements, terminal block.
Cloudy Water Despite Running
Pump runs fine but water stays cloudy — almost always filter or chemistry.
Freeze Damage
Cracked housing after a freeze — assess and decide repair vs replace.
How Long to Run It
Calculate the right daily run time for your pool size.
VS Pump Diagnosis
General variable-speed diagnosis across all brands.
Sta-Rite Troubleshooting
Dyna-Pro, Max-E-Pro, and IntelliPro fixes.
Winterization Guide
How to properly shut down for winter without freeze damage.
Hayward VS Problems
EcoStar and MaxFlo VS error codes and fixes.
Motor Bearings Failing
Grinding and screeching — confirm bearing failure and what to do.
Diffuser Problems
Weak flow with low pressure even after cleaning the filter.
Won’t Start After Winter
Spring startup sequence and the 5 reasons pumps fail to restart.
Pressure Gauge Guide
How to read it and when a stuck gauge needs replacing.
Two-Speed Pump Issues
Stuck on one speed or neither speed working.
Low Pressure
Below baseline pressure — 6 causes in order, starting with the basket.
Check Valve Problems
Losing prime overnight or water draining back after shutoff.
How to Prime It
The correct fill-and-start sequence for every pump situation.
Electricity Cost
What your pump actually costs to run and how to cut the bill.
Installation Guide
How to install a new pump yourself — plumbing and wiring.
Maintenance Schedule
Weekly to annual tasks that prevent 90% of failures.
Jandy Troubleshooting
Stealth single-speed and VS FloPro fixes.
Waterway Troubleshooting
Executive series and Waterway-specific part notes.
Seal Plate Replacement
When a worn seal plate causes repeat shaft seal failures.
Starts Then Stops
Timing of the shutdown narrows down the cause fast.
DE Filter Problems
DE powder returning to the pool, torn grids, dosing errors.
Flow Rate (GPM) Guide
Calculate the GPM your pool actually needs.
GFCI Keeps Tripping
Don’t keep resetting it — 5 causes of a real ground fault.
Cavitation
That rushing/gravel sound means the pump can’t get enough water.
Repair Cost Guide
What every common repair should cost — DIY vs pro.
Single vs Variable Speed
The real cost comparison with numbers.
Sand Filter Problems
High pressure, cloudy water after backwash, sand in pool.
Plumbing Guide
Union fittings, pipe sizing, and common plumbing problems.
Pentair WhisperFlo
Single-speed and VS/VST WhisperFlo fixes.
Cover Pump Issues
A different pump entirely — winter cover water removal.
Multiport Valve Problems
Leaking, stuck, or wrong-position — almost always the spider gasket.
Pump Sizing for Solar
Adding solar heating? You almost always need a bigger pump.
What Size Pump Do I Need
Buying guide — size by pool volume without overbuying.
Return Jets Not Working
Stuck eyeballs, missing inserts, cracked faceplates.
Skimmer vs Main Drain
Isolate which suction source is actually restricted.
Rebuild Kit — Worth It?
When a full rebuild kit beats buying individual parts.
AO Smith/Century Motors
Cross-reference your motor regardless of pump brand.
Multimeter Testing Guide
Test the capacitor and motor windings before buying parts.
Won’t Turn Off
Stuck timer, welded relay, or automation override.
Automation Integration
Hayward, Pentair, and Jandy app control explained.
Suction vs Pressure Side
The foundation concept behind every diagnosis on this site.
Warranty Guide
What’s covered, what voids it, how to file a claim.
Troubleshooting Flowchart
Match your symptom to the right fix in under a minute.
Sizing for New Construction
Get plumbing and pump decisions right before they’re locked in.
LED Light Indicator Codes
What flashing red/green status lights mean on simpler pumps.
Drain Plug Stuck
How to remove a stuck plastic plug without stripping it.
O-Ring Sizes Guide
Identify and order the correct O-ring for each location.
Inground vs Above-Ground
What actually differs between pump types — and can you swap them.
Pentair IntelliFlo Error Codes
What each alarm code means and how to clear it.
Capacitor Test & Replace
The $15 fix most people miss when a pump hums and won’t start.
Weak Flow
What’s blocking your suction and how to fix it.
Hayward Super Pump
Fix the most common Super Pump problems.
Shaft Seal Leak
Diagnose and replace a leaking shaft seal.
Can’t Find Your Problem?
Describe what your pump is doing and we’ll point you to the right guide.