Published March 5, 2026 by A Clean Pool USA
Your pool pump is the single most important piece of equipment in your pool system. Without it, water does not circulate, your filter does not work, chemicals do not distribute, and your pool turns into a stagnant pond. In Florida, where warm temperatures accelerate algae growth, a pump that is down for even two or three days can lead to a green pool. So when your pump stops working, you need to figure out why and fix it fast.
Here are the most common pool pump problems we see across Winter Garden, Windermere, Orlando, and the rest of Central Florida, along with what you can troubleshoot yourself and when it is time to call a professional.
The Pump Will Not Turn On at All
You flip the switch or check the timer, and nothing happens. No sound, no movement, no hum. This is actually one of the easier problems to diagnose because you can often rule out the pump itself before calling for service.
Check the Basics First
- Circuit breaker: Check your electrical panel. Pool pumps are typically on a dedicated 20-amp or 30-amp breaker. If the breaker has tripped, reset it once. If it trips again immediately, stop. There is an electrical fault that needs professional diagnosis.
- Timer or automation system: If your pump runs on a timer, check that the timer is set correctly and functioning. Timers can fail, lose their programming after a power outage, or have tripped internal breakers. If you have a pool automation system (Pentair, Hayward, Jandy), verify that the pump is scheduled to run and that the system is not in service mode.
- GFCI outlet: Some pool equipment is protected by a ground fault circuit interrupter. Check for a tripped GFCI button on the outlet or breaker.
- Disconnect switch: Many pool equipment pads have a disconnect switch within sight of the pump. Make sure it is in the "on" position.
If all of the above check out and the pump still will not turn on, the problem is likely the motor, the capacitor, or the wiring. These require a qualified electrician or pool technician to diagnose and repair.
The Pump Hums But Will Not Start
You hear a low, steady hum from the motor, but the shaft is not spinning. This is one of the most common pump problems we encounter, and it usually points to one of two issues.
Bad Start Capacitor
The start capacitor is a small cylindrical component on top of or inside the motor housing. Its job is to provide the initial burst of energy needed to get the motor spinning. When a capacitor fails, the motor receives power (hence the hum) but cannot start rotating. Capacitors are relatively inexpensive ($15 to $40 for the part) and straightforward for a technician to replace. This is one of the most common and cost-effective pool pump repairs.
Seized Motor
If the motor shaft has seized (meaning it physically will not rotate), the motor is trying to start but cannot overcome the resistance. This can happen when bearings fail, when corrosion locks up internal components, or after the motor overheats and the internal thermal protector trips. A seized motor usually means the motor needs to be replaced. In some cases, the bearings can be replaced if the motor is otherwise in good condition, but this is labor-intensive and the cost often approaches that of a new motor.
Safety note: If your pump is humming but not starting, do not leave it in this state. The motor is drawing full amperage while stalled, which generates heat and can cause an electrical fire. Turn off the breaker and call for service.
The Pump Starts But Shuts Off Quickly
The motor fires up, runs for a few seconds to a few minutes, and then shuts itself off. This is usually a thermal overload issue.
Overheating
Pool pump motors have a built-in thermal overload switch that shuts the motor off when it gets too hot. In Florida, where ambient temperatures regularly reach the mid-90s and equipment pads often sit in direct sun, overheating is common. Contributing factors include:
- Poor ventilation around the motor (equipment enclosures without adequate airflow)
- A motor vent cover clogged with dirt, leaves, or debris
- Low voltage from the electrical supply (the motor works harder to compensate)
- Worn bearings creating internal friction and heat
- Running the pump during the hottest part of the day without shade
Clean the motor vents, ensure adequate airflow around the equipment, and check for obstructions. If the motor continues to overheat after addressing these factors, the motor bearings or windings may be failing, and replacement is likely the next step.
Electrical Issues
Loose wiring connections, corroded terminals, and undersized wiring can all cause intermittent shutdowns. Florida's humidity and salt air (even inland) accelerate electrical corrosion. A pool technician or electrician can check connections, measure voltage and amperage, and identify electrical problems.
The Pump Is Running But Not Moving Water
The motor sounds normal and the shaft is spinning, but you can see through the pump lid that there is little or no water flowing, or your filter pressure gauge reads near zero. This is called losing prime, and it is extremely common in Florida.
Air Leak on the Suction Side
The pump relies on a sealed suction line from the pool to draw water. Any air leak between the pool and the pump impeller prevents the pump from maintaining its prime. Common air leak sources include:
- A cracked or warped pump lid
- A worn or compressed pump lid O-ring
- Loose or cracked fittings on the suction plumbing
- A failing shaft seal where the motor shaft enters the wet end
- A low water level in the pool (the skimmer is pulling air instead of water)
Start simple. Check the pump lid O-ring for cracks, flat spots, or dryness. Clean it, lubricate it with a silicone-based lubricant (never petroleum-based), and reseat it. Make sure the pump lid is tightened evenly and firmly. Check your pool water level: it should be at the midpoint of the skimmer opening. If the O-ring and water level are fine, the leak is likely in the plumbing or the shaft seal, which requires professional diagnosis.
Clogged Impeller
The impeller is the spinning component inside the pump that actually moves the water. Small debris (pine needles, palm fibers, small leaves, hair ties) can get past the strainer basket and clog the impeller. A partially clogged impeller reduces flow dramatically, and the pump may sound normal even though it is not moving much water.
To check the impeller, turn off the pump, remove the strainer basket, and carefully reach into the volute (the chamber behind the basket) to feel the impeller. If you feel debris wrapped around the impeller vanes, pull it out. This is a common and free fix that many homeowners can do themselves. Just make sure the pump is off and the breaker is turned off before reaching into the volute.
Clogged or Dirty Filter
A severely clogged filter restricts water flow enough that the pump cannot push water through effectively. If your filter pressure gauge is reading significantly above normal (more than 10 psi above the clean baseline), the filter needs cleaning. Backwash a sand or DE filter, or remove and hose down a cartridge filter. If the pressure remains high after cleaning, the filter media may need replacement. For more details on filter maintenance schedules, see our homeowner tips guide.
The Pump Is Leaking Water
Water around the base of your pump is not just an annoyance. It is a warning sign that something needs attention before it becomes a bigger problem.
Shaft Seal Leak
The shaft seal is a mechanical seal where the motor shaft passes through the pump housing. It keeps water inside the wet end and air out. Over time (especially in Florida's heat), the seal wears out and begins to drip. A small drip will become a steady leak. If left unaddressed, water can reach the motor bearings and destroy the motor.
A shaft seal replacement costs $80 to $150 with parts and labor. A new motor costs $300 to $600. Replacing the seal early is one of the smartest preventive maintenance investments you can make.
Cracked Pump Housing
Florida's UV radiation degrades plastic components over time. Pump housings, lids, and fittings can develop hairline cracks that worsen with each freeze-thaw cycle (yes, Florida does get occasional freezes that stress PVC and plastic). A cracked housing needs replacement. If the pump is older than 10 years and the housing cracks, it is usually more cost-effective to replace the entire pump.
Loose Fittings or Union Connections
The threaded unions that connect your pump to the plumbing can loosen over time from vibration. A small wrench turn can sometimes fix a leak. Be careful not to overtighten PVC fittings, as they can crack. Hand-tight plus a quarter turn is usually sufficient.
The Pump Is Making Unusual Noises
Pool pumps are not silent, but they should produce a steady, consistent hum. Any change in sound is worth investigating.
Grinding or Screeching
This almost always indicates failing motor bearings. The bearings allow the motor shaft to spin smoothly. When they wear out, metal grinds against metal. A pump with bad bearings will get louder over time and eventually seize. Bearing replacement is possible on many motors, but if the motor is more than 7 to 8 years old, replacing the entire motor is usually the better investment.
Loud Rattling or Vibrating
Check that the pump is sitting level and that the mounting bolts are tight. A pump that has shifted on its base can vibrate excessively and create a rattling noise. Also check the strainer basket: a cracked or broken basket can rattle inside the housing. If the noise started suddenly after a recent service visit, make sure the basket was reinstalled correctly.
Cavitation (Sounds Like Gravel in the Pump)
Cavitation occurs when the pump is starved for water and air bubbles form and collapse inside the pump housing. It sounds like rocks or gravel tumbling inside the pump. Causes include a clogged skimmer basket, a dirty pump strainer basket, a partially closed valve on the suction line, or an undersized pump pulling more water than the plumbing can deliver. Cavitation damages the impeller over time, so address the water supply issue promptly.
Variable-Speed Pump Problems
Variable-speed pumps (now required by Florida building code for new installations and replacements) have additional components that can fail. The variable-speed drive board is essentially a computer that controls motor speed. Error codes on the display, speed fluctuations, or failure to maintain a set speed usually indicate a drive board problem. These repairs require a technician familiar with the specific brand (Pentair IntelliFlo, Hayward TriStar VS, Jandy VS FloPro, etc.).
Variable-speed pumps are more expensive to repair than single-speed pumps, but they are significantly cheaper to operate daily. A single-speed pump costs $60 to $100 per month in electricity in Florida. A variable-speed pump running at optimized low speeds costs $15 to $30 per month. The energy savings usually pay for the higher equipment cost within 2 to 3 years.
When to Repair vs. When to Replace
Here is a general guideline:
- Repair if the pump is less than 5 years old and the repair cost is under 50% of a new pump
- Replace if the pump is 8+ years old, needs a major repair, or is a single-speed pump (upgrade to variable-speed for energy savings and code compliance)
- Replace if you have had multiple repairs in the last 12 months (the pump is telling you it is done)
- Always replace if the motor has been submerged in a flood or has visible rust and corrosion on the frame
A quality variable-speed pump installed by a licensed pool contractor typically runs $1,000 to $1,800 including labor, and it should last 8 to 12 years with proper maintenance.
Do Not Let a Pump Problem Become a Pool Problem
In Florida, your pool can go from clear to green in 48 hours without circulation. If your pump is down and you cannot fix it immediately, there are a few things you can do to buy time:
- Add liquid chlorine directly to the pool (2 gallons per 10,000 gallons) to maintain sanitizer levels
- Brush the walls and floor daily to prevent algae from attaching
- Run a garden hose into the pool to create some surface agitation (not a substitute for real circulation, but better than nothing)
But do not wait long. Get the pump repaired or replaced as quickly as possible.
Let Us Diagnose It for You
At A Clean Pool USA, our technicians diagnose and repair pool pump problems every day across Winter Garden, Windermere, Ocoee, Dr. Phillips, Lake Nona, Celebration, Kissimmee, Altamonte Springs, Casselberry, and Sanford. We give honest assessments of whether your pump needs a repair or a replacement, and we will never sell you a new pump when a $30 capacitor would fix the problem.
If you are already on our weekly service plan, equipment monitoring is included. We catch pump problems early, before they leave you without circulation and staring at a green pool.