Pool Pump Repair
Step-by-step repair guides for every major pool pump failure — written by a 39-year repair veteran.
Repair by Symptom
Won’t Turn On
No response when switched on — power, breaker, timer, motor diagnosis
Hums, Won’t Start
Power is reaching the motor but it won’t spin — usually capacitor or seized shaft
Trips the Breaker
Breaker cuts out — electrical fault, overloaded circuit, failing motor
Leaking Water
Water around the pump — shaft seal, O-ring, union, or housing crack
Making Noise
Grinding, screeching, rattling — each noise points to a different cause
No Suction / Weak Flow
Low pressure, cloudy water — blocked impeller, dirty filter, or air leak
Repair by Part
Motor Replacement
When the motor needs rebuilding or replacement — what to check first
Capacitor
Test and replace — the easiest $15 fix in pool pump repair
Impeller
Clean or replace a clogged or damaged impeller
Shaft Seal
Replace the shaft seal and O-rings — stops most leaks for good
Pump Basket
Clean and replace a cracked or clogged strainer basket
Pump Housing
Volute cracks, air leaks, structural damage — repair or replace
Repair vs. Replace — The Honest Guide
A pool pump motor typically lasts 8–12 years. If your pump is under 5 years old and the failure is a single component — capacitor, seal, impeller — repair almost always makes sense. If the motor is 10+ years old and showing multiple symptoms, replacement is usually the smarter investment.
The guides on this site tell you which situation you’re in before you spend a dollar. See all repair vs. replace guides →
Not Priming
Pump runs but won’t build suction — 7 causes from O-ring to air leak, free fixes first
Leaking Water
Shaft seal, lid O-ring, union fittings, or cracked housing — location tells you the fix
Impeller Clogged
Pump sounds fine but pressure gauge near zero — free fix in 20 minutes
Motor Replacement
How to match and swap the motor yourself — saves $150–300 in labor
Above-Ground Pumps
Priming failure, filter clogs, thermal trips — fixes specific to above-ground systems
Losing Prime
Primes then loses suction after 10–20 minutes — slow air leak, shaving cream test, 6 causes
Making Noise
Grinding, screeching, humming, rattling — each sound points to a different cause and fix
Overheating
Trips thermal overload and shuts off — airflow, impeller, voltage, capacitor, windings
Pentair SuperFlo
Humming, VS error codes, weak flow, shaft seal — single-speed and variable-speed models
Replacement Cost Guide
Single-speed $200–450, variable-speed $600–1,100 — plus repair vs replace decision guide
Start with the Full Troubleshooting Guide
Not sure where to begin? The troubleshooting index organizes every problem by symptom, brand, and part.