My Pool Pump Is Making A Humming Noise: Troubleshooting 2023

My Pool Pump Is Making A Humming Noise

“Help, My Pool Pump Is Making A Humming Noise”. Several issues could be causing this irritating noise, from jammed impellers to faulty capacitors.

In this blog post, we’ll walk you through the reasons behind your pool pump’s noisy performance and provide some simple solutions to silence it. Ready for a quieter backyard oasis? Stick around!

Key Takeaways

  • A common reason for a pool pump humming noise is a jammed or blocked impeller, which can be prevented by regularly checking and cleaning the skimmer and pump debris basket.
  • faulty or bad capacitor can also cause a pool pump to emit a humming noise. If the capacitor is damaged or worn out, it should be replaced to resolve the issue.
  • Another possible cause of a humming noise in a pool pump is a bent or misaligned pump shaft, which can be identified by vibrations and should be fixed promptly to prevent further damage.
  • An imbalance of the pump impellercavitation, and pump flow pulsation are other factors that can contribute to pool pump humming noises. These issues should be addressed through regular maintenance and timely repairs.

Common Reasons for a Pool Pump Humming Noise

The common reasons for a pool pump humming noise include a jammed or blocked impeller, a faulty or bad capacitor, a bent or misaligned pump shaft, an imbalance of the pump impellercavitation, pump flow pulsation, and the pump not being primed.

Jammed or blocked impeller

Debris trapped in your pool pump’s impeller can trigger a humming noise. This jam blocks the rotation of the impeller, which is essential for water circulation. As power continues to flow without rotation, it produces a low hum.

Regularly checking your skimmer and pump debris basket can help prevent this issue, as larger debris often gets past these areas and lodges into the impeller causing an obstruction.

If you notice such a sound or a drop in water pressure – both signals of possible blockage – it’s crucial to address it promptly by cleaning out any trapped particles before they cause further damage to your swimming pool pump system.

Faulty or bad capacitor

A humming pool pump can often be a symptom of a faulty or bad capacitor. This essential component acts like a start-up battery for your pool pump’s motor, and if damaged or worn out, it could cause the motor to emit an unsettling hum.

The capacitor is responsible for providing power that sparks the rest of the mechanical parts into action.

Stepping up to a higher amperage due to a failing capacitor may lead your motor to work overtime, resulting in high wattage usage and annoying noise disturbances. Commonly, buzzing or humming noises are linked directly with problems in the pool pump capacitor.

Hence, if your swimming pool pump suddenly starts serenading you with loud humming sounds, there’s a good chance you might need to replace its worn-out capacitor!

Bent or misaligned pump shaft

bent or misaligned pump shaft can often be the culprit behind a noisy pool pump. This problem typically occurs near the coupling, leading to vibrations responsible for that disruptive hum you hear.

You can use dial indicators to spot this issue, characterized by high axial vibrations at your pump’s rotation speed. Not only does it result in a loud humming noise, but it also causes noticeable vibrations while your pool equipment is active.

Overlooking this common pool pump problem could amplify over time as continuous friction makes the motor hot and intensifies the noise even more! Fixing a bent or misaligned shaft promptly will help restore peace around your swimming pool area and extend the life of your pool motor.

Imbalance of the pump impeller

One common reason for a pool pump humming noise is an imbalance of the pump impeller. When the impeller becomes imbalanced, it can cause vibrations in the motor and make the pool pump seem misaligned.

These vibrations and misalignment result in a loud humming noise. It’s important to address this issue promptly because prolonged use of an imbalanced impeller can damage the motor and other components of the pool pump.

Regular maintenance and checking for any signs of imbalance in the impeller can help prevent this problem from occurring in the first place.


Cavitation is one of the common causes of a humming noise coming from your pool pump. This occurs when air bubbles form and collapse within the pump, creating vibrations and loud clattering sounds.

These cavitation-induced vibrations can be identified by the humming noise they produce. Cavitation is often caused by an imbalance in water flow or low water levels in the pool, which leads to excessive pressure and air being drawn into the pump.

To fix this issue, you will need to ensure enough water in your pool and address any issues with the pump’s impeller or other components that may be causing imbalances in water flow.

Pump flow pulsation

Pump flow pulsation can contribute to the humming noise from your pool pump. When there is an imbalance in the pump impeller or issues with the motor, it can cause fluctuations in water flow, resulting in a pulsating effect.

This irregular water flow can create vibrations and noise within the pump system. It’s important to properly align the pump shaft, balance the impeller, and address any bearing problems to minimize this issue.

By ensuring smooth and consistent water flow, you can reduce or eliminate the humming noise caused by pump flow pulsation.

Pump not primed

One common reason for a pool pump humming noise is if the pump is not primed properly. This means there may not be enough water in the pump, causing it to struggle and make a humming sound.

To fix this issue, you can check if the pump is primed by ensuring that all suction lines are open and there are no clogged skimmers or debris baskets. It’s important to have a sufficient amount of water in the pump for it to function correctly and avoid any annoying humming noises.

My Pool Pump Is Making A Humming Noise: How to Fix

To fix a humming pool pump, check if the pump is primed and then unclog the pump impeller. Make sure the motor shaft spins freely, check the pool pump capacitor, and tighten any loose terminals.

If all else fails, it may be time to seek professional help. Read on to learn more about troubleshooting your pool pump noise.

Check if the pump is primed.

To determine if your pool pump is properly primed, follow these steps:

  1. Ensure that the pump basket and skimmer basket are free of debris. A clogged basket can prevent proper water flow and cause the pump to hum.
  2. Check the water level in the pool. If it’s too low, the pump may not be able to pull in enough water to prime itself.
  3. Make sure all valves leading to and from the pump are open. Closed valves can restrict water flow and prevent the pump from priming.
  4. Verify that there are no air bubbles in the pump basket or return lines. Air in the system can impede proper priming.
  5. Turn on the pump’s power and listen for unusual noises or vibrations.
  6. Watch for water flowing into the pump basket within a few seconds of turning on the pump. This indicates that it is successfully primed.

Unclog the pump impeller

To fix a humming pool pump, one of the first things you should do is check and unclog the pump impeller. A clogged impeller can restrict water flow and cause the motor to hum without pumping water effectively. Here are some steps you can take to unclog the pump impeller:

  1. Switch off power to the pool pump by turning off the circuit breaker or unplugging it.
  2. Locate the pump basket or strainer housing near the pool pump motor.
  3. Remove the lid or cover of the pump basket to access the impeller.
  4. Inspect the impeller for any debris, such as leaves, twigs, or small rocks that may obstruct movement.
  5. Carefully remove any debris from the impeller using your hands or a small tool like pliers or tweezers.
  6. Once you have cleared out any obstructions, replace the lid or cover of the pump basket securely.
  7. Turn on power to the pool pump and listen for any changes in noise.
  • clogged impeller can cause a humming noise in a pool pump.
  • Switching off power to the pool pump is necessary to check the status of the impeller.
  • clogged impeller can make a grinding sound similar to a low, humming noise.
  • If the pool pump is making a humming sound when starting up, it may indicate a clogged impeller.
  • A humming noise in a pool pump may indicate a problem with the impeller.
  • pool pump that is humming but not working may have a clogged impeller.

Check the shaft of the pump spins freely

If your pool pump is making a humming noise, one possible reason could be that the shaft of the pump is not spinning freely. To troubleshoot this issue, follow these steps:

  1. Power off the pool pump and unplug it from the electrical outlet.
  2. Remove the cover or lid of the pump to access the impeller and motor shaft.
  3. Carefully inspect the shaft to ensure it is not bent or misaligned. If you notice any damage, it may need to be repaired or replaced.
  4. Gently try to spin the shaft by hand. It should move freely without any resistance or grinding sensation.
  5. If you encounter difficulty in spinning the shaft or if it feels stuck, there may be debris or obstructions causing the issue.
  6. Clean out any debris or blockages from the area around the shaft using a soft brush or cloth.
  7. Once you have cleared away any debris, try spinning the shaft again to see if it moves more freely.
  8. If the shaft still does not spin smoothly after cleaning, there may be an internal issue with the motor or bearings that requires professional assistance.
  • Pool pump motors have bearings to reduce friction, and problems with these bearings can result in loud humming noises.
  • Bent motor shafts can also contribute to a pool pump making a loud humming noise.
  • Troubleshooting steps for a humming pool pump may include checking the pump shaft, impeller, and capacitor.

Check the pool pump capacitor

One possible reason for a humming pool pump is a faulty or bad capacitor. To check the pool pump capacitor, you can:

  1. Turn off the power to the pump by switching off the circuit breaker.
  2. Locate the capacitor, which is usually cylindrical in shape and located near the pump motor.
  3. Inspect the capacitor for any signs of damage such as bulging or leaking.
  4. Use a multimeter to check if the capacitor is functioning properly. Set the multimeter to measure capacitance and touch the probes to the terminals of the capacitor. If it shows a reading close to its rated capacitance, it is likely still working fine.
  5. If there is no reading or a significantly lower reading on the multimeter, it indicates that the capacitor needs to be replaced.
  6. Replace the faulty capacitor with a new one of similar specifications.

Check for loose terminals

Loose terminals can be associated with the humming of a pool pump and may need to be checked and fixed. Here are some steps to follow:

  1. Turn off the power: Before checking for loose terminals, make sure to turn off the power to the pool pump at the circuit breaker box. This will ensure your safety while working on the electrical components.
  2. Open the pump housing: Remove the screws or clamps that secure the pump housing. Carefully open it up to expose the motor and its components.
  3. Inspect the terminals: Look for any loose or disconnected wires around the motor terminals. These are usually located at the back of the motor. If you notice any loose connections, gently tighten them using a screwdriver or pliers.
  4. Check for corrosion: Corrosion on terminals can lead to poor conductivity and cause humming or other electrical issues. Use a wire brush or sandpaper to clean off any corrosion from the terminals.
  5. Reassemble and test: Once you have tightened any loose terminals and cleaned off any corrosion, carefully reassemble the pump housing. Make sure all screws or clamps are securely fastened. Turn on the power at the circuit breaker box and test if the humming noise has been resolved.
  6. Seek professional help if needed: If you are unsure about working with electrical components or if you still hear a humming noise after checking for loose terminals, it is best to seek professional help from a pool technician or electrician.

Check if the motor is burnt out

If your pool pump is making a humming noise, it’s important to check if the motor is burnt out. Here are some steps you can take to determine if this is the issue:

  1. Inspect the motor for any visible signs of damage or burning, such as blackened areas or melted components.
  2. Turn off the power to the pump and allow it to cool down before proceeding.
  3. Carefully touch the motor with your hand to see if it feels excessively hot. A burning smell may also indicate a burnt-out motor.
  4. If you have access to a multimeter, you can use it to test the continuity of the motor’s windings. This will help identify any open circuits that could be causing the problem.

Preventive Maintenance for Pool Pumps

For preventive maintenance, make sure to regularly clean and maintain your pool pump to prevent any issues from arising.

Regularly clean and maintain the pump

Regularly cleaning and maintaining your pool pump is vital for keeping it in optimal condition and preventing issues like a humming noise. Here are some important steps to include in your maintenance routine:

  • Inspect the pump regularly for any signs of damage or wear.
  • Clean the pump basket and remove any debris that may have accumulated.
  • Check the impeller for clogs or blockages and clean if necessary.
  • Lubricate the pump bearings with recommended oils to prevent bearing failure.
  • Keep an eye on your pool’s water level and ensure it’s always at the appropriate level for proper pump operation.
  • Monitor the pressure gauge on your pool filter to ensure it’s within the normal range.
  • If you notice any unusual noises or vibrations from the pump, address them promptly.

Monitor and address any issues promptly

  • Regularly inspect your pool pump for any strange noises or vibrations.
  • Pay attention to any changes in the noise level or performance of the pump.
  • If you hear a humming noise from the pump, investigate immediately.
  • Check for any clogs or blockages in the impeller and unclog if necessary.
  • Monitor the water flow and pressure to ensure they are at optimal levels.
  • Keep an eye out for leaks or air bubbles in the system, as these can indicate a problem.
  • If you notice any signs of damage or wear on the motor or other components, take action to address them promptly.
  • Please don’t ignore any unusual sounds or vibrations from your pool pump, as they can be early warning signs of potential issues.
  • Regular maintenance and inspections can help prevent larger problems down the line.

When to Seek Professional Help

If you encounter complex issues requiring expert knowledge, safety concerns, or electrical problems, it is best to seek professional help for your pool pump.

Complex issues that require expert knowledge

If you’re facing complex issues with your pool pump causing a humming noise, it may be best to seek professional help. Expert knowledge is often necessary to properly diagnose and repair these problems.

It’s important to remember that pool pumps have intricate components and electrical systems, so having a trained technician assess the situation can save you time, money and potential safety hazards.

They can troubleshoot any underlying issues and provide the most effective solution for getting your pool pump back in working order.

Safety concerns or electrical issues

If your pool pump is making a humming noise, it’s important to consider the potential safety concerns and electrical issues associated with it. A humming noise can indicate underlying electrical problems, such as a malfunctioning capacitor or motor.

These issues should not be taken lightly, as they can pose a safety risk if not addressed properly. It is advisable to seek professional help to diagnose and repair any electrical issues related to your pool pump.

Ignoring these problems could lead to further damage or potential hazards, so it’s crucial to address them promptly and ensure the safety of your pool equipment.


In conclusion, if your pool pump is making a humming noise, it’s important to address the issue promptly to prevent further damage. By identifying the common reasons for the noise and following the proper steps to fix it, you can keep your pool pump running smoothly and enjoy a quiet swimming experience.

Remember, regular maintenance and monitoring are key in preventing future issues with your pool pump.

Additional Resources and FAQs

For additional resources and frequently asked questions about pool pump issues, there are a variety of online forums and websites dedicated to helping pool owners troubleshoot and resolve their problems.

These resources often provide step-by-step guidesvideo tutorials, and troubleshooting tips specific to different types of pool pumps. Some common FAQs include how to quiet a noisy pool pump, fix a humming noise in the pump motor, and prevent future issues with your pool pump.

It’s important to note that if you’re unsure about fixing or repairing your pool pump, it’s always best to consult a professional for guidance and assistance. Regular maintenance and prompt addressing of any issues are crucial in keeping your pool pump running smoothly for years.


1. What could be causing my pool pump to hummer?

Humming noises from your pool pump can indicate several possible causes. These include a clogged impeller, air leak, mechanical seal issues, or damaged impeller. Bad bearings in the pump can also lead to excessive vibrations, manifesting as loud noise.

In some cases, it could be due to high temperatures affecting the pump body or a short circuit in the pump’s electrical system.

2. How can I troubleshoot the humming noise from my pool pump?

To troubleshoot the humming noise, the first thing to check is the impeller. Ensure it’s not blocked by large debris and the impeller spins freely. Double check the water level as well; low water flow or a low water level could lead to noise. It would be best to inspect the pump lid and the shaft seal for leaks.

If the noise persists, it’s a good idea to take a closer look at the motor shaft spin and the wet end of the pool pump. However, it may be best to consult with a professional if you’re not able to fix it yourself, especially for older pumps, as the humming noise might be due to a more serious issue, such as a bad motor or a problem with the start capacitor.

3. Can I continue using my pool pump if it’s making a humming noise?

It’s not recommended to keep using a pool pump that’s making a humming sound. This sound often warns of underlying pool pump problems, and continuing use could lead to more serious issues, potentially requiring a new pump or motor.

If you hear a loud buzzing or louder noise, it’s best to turn off the pump and consult a professional.

4. How much does fixing a humming pool pump typically cost?

The cost of fixing a humming pool pump varies depending on the specific issue and the extent of the repairs needed. Simple fixes, like removing a jammed impeller or sealing an air leak, might not be expensive.

But if the problem lies with the motor or the start capacitor, the repair costs could be considerably higher. In some cases, replacing the whole motor or even the pump might be more economical. The only way to know is to get a professional assessment and quote.

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