A pool pump that isn’t working right can throw your whole system off. Water stops moving, the filter can’t do its job, and, ultimately, your pool starts to look and feel off—fast. Most problems come from just a few common issues, but the good news is that you can spot them early. Here’s what to look for and what to do next if your pump starts acting up, from the pool cleaning and maintenance experts at Blue Science pools.
1. Pump Won’t Start
If your pump doesn’t turn on, start by checking power. A tripped breaker is often the culprit. Flip it off and back on to reset. Still nothing? Check the pool timer. It may be off or set incorrectly.
If the motor tries to run but just hums, it could be overheating or burned out. Shut it off immediately. A burnt smell or unusually hot housing means it’s time to stop troubleshooting.
If the pump still doesn’t run, don’t force it. Continuing to power a damaged motor can make things worse. At that point, call in a pro to diagnose it safely. A failed capacitor, wiring issue, or motor burnout likely needs repair or replacement.
2. Pump Is Losing Prime or Not Circulating Water
If your pump is running but not moving water, it’s likely losing prime. The first thing to check is the water level. If the pool water drops below the skimmer, air gets pulled into the system. Top it off so the skimmer stays fully submerged. Next, clean the skimmer and pump baskets. Debris buildup restricts flow and chokes the pump. After that, open the pump lid and inspect the O-ring. It should sit flat and form a solid seal. If it’s dry or cracked, it won’t hold pressure. Lubricate or replace it if needed.
Look for air bubbles in the pump basket or at the return jets. That’s a sign of air leaks somewhere in the suction line—often at fittings or valves. Poor circulation doesn’t just waste energy—it invites algae, cloudy water, and uneven chemical distribution. Fix it fast to avoid bigger problems.
3. Strange Noises Coming from the Pump
Pool pumps shouldn’t sound like power tools. If you hear grinding, screeching, or loud humming, something’s off.
Grinding or screeching usually means the motor bearings are shot. They wear down over time and can’t be repaired—just replaced. A loud hum might mean debris is stuck in the impeller, or the motor is trying to turn but can’t. Cavitation is another culprit. That happens when the pump isn’t getting enough water, often due to a clogged line or air leak. It creates a rattling or slurping noise.
Start by cutting power to the pump. Clean out the skimmer and pump baskets, then check for anything blocking water flow. If the sound won’t go away or you suspect internal damage, it’s time to call Blue Science Pools.
4. Leaking Pool Pump
If you spot water pooling around your pump, don’t ignore it. Leaks usually show up around the housing, shaft seal, or pipe fittings.
Cracked gaskets and worn-out seals are common culprits. Fittings can also loosen or corrode over time, letting water seep out. Check for visible cracks, dripping near the base, or moisture around the pipes. Even a slow leak matters.
Leaks don’t just waste water—they can damage the motor or create an electrical hazard. If the pump stays wet, it won’t last long. Stop the pump and inspect closely. If you can’t find the source or fix it quickly, call in a pro.
5. Pump Is Running But Pool Still Looks Dirty
In this situation, a clogged filter could be slowing water flow. The pump might be undersized or set to the wrong speed. You could also have a broken impeller or blocked return lines.
Start with the basics and clean the filter, then look for obvious debris. Double-check that your pump matches the size and needs of your pool. If you’ve done all that and water still isn’t circulating right, you should consider calling in an expert to take a look.
Get Professional Assistance
Pool pump problems don’t fix themselves. Blue Science Pools handles everything from diagnostics to pool equipment repair. If your system isn’t running right, don’t wait. Reach out and let our experts keep your pool clean, clear, and running strong.