When Your Pool Pump Stops Working
The pump is the heart of your pool. It circulates water through the filter and keeps chemicals mixed and effective. When it fails, your water can turn green in a matter of days. Here's how to diagnose the problem and what repairs typically cost.
Common Pool Pump Problems
1. Pump Won't Turn On
Likely causes: tripped breaker, bad capacitor, failed motor, or a timer/automation issue. Repair cost: $150-$400 (capacitor replacement is on the low end; motor replacement higher).2. Pump Runs But Won't Prime (No Water Movement)
Likely causes: air leak on the suction side, clogged impeller, low water level, or a bad lid o-ring. Repair cost: $100-$300, depending on whether it's a simple o-ring or a clogged impeller.3. Pump Is Loud or Screeching
Likely causes: worn bearings (screeching) or a clog/cavitation (rattling/growling). Repair cost: bearing replacement $150-$300; if the motor is far gone, full replacement.4. Pump Is Leaking
Likely causes: worn shaft seal, cracked housing, or failed o-rings. Repair cost: shaft seal $150-$250; cracked housing usually means replacement.5. Pump Keeps Shutting Off
Likely causes: overheating from poor ventilation, low voltage, or a failing motor. Repair cost: $150-$400, depending on root cause.Repair vs Replace
Here's a simple rule of thumb:
| Situation | Recommendation |
|---|---|
| Pump under 5 years old, minor part failed | Repair |
| Capacitor, o-ring, or seal failure | Repair |
| Motor failure on a pump 8+ years old | Replace |
| Cracked housing | Replace |
| Single-speed pump (older) | Consider upgrading to variable-speed |
The Variable-Speed Upgrade Worth Considering
If your old single-speed pump dies, strongly consider a variable-speed pump. They cost more upfront ($500-$1,500 installed vs $300-$700 for single-speed) but:
- Cut energy use by 50-80%
- Run quieter
- Often pay for themselves in 1-2 years through lower electric bills
- Are required by energy codes in some states for new installs
Typical Total Costs (2026)
- Diagnostic/service call: $75-$150
- Capacitor replacement: $150-$250
- Motor replacement: $300-$600
- Full single-speed pump replacement: $400-$900 installed
- Full variable-speed pump replacement: $700-$1,800 installed
Can You DIY It?
Some pump repairs are DIY-friendly (cleaning the impeller, replacing an o-ring or lid). Others — motor wiring, capacitor replacement, plumbing — carry electrical and warranty risk. If you're not comfortable around 240V wiring, hire a pro.
Bottom Line
A struggling pump is an emergency for your water quality. Diagnose the symptom, weigh repair against replacement age, and if you're replacing, look hard at variable-speed for the long-term savings.
Find a pool repair company near you for pump diagnostics, repairs, and replacement quotes.