A pool pump that hums but will not run is telling you the motor is getting power and the shaft is not turning. That is a different job from a pump that spins and will not prime. Refresh Pool Pros connects San Diego homeowners with licensed independent pump specialists. We do not repair motors ourselves.
Shut the pump off. A humming motor that cannot start will heat up. This is not a case for letting it try again.
Hum versus prime versus leak
Three common pump complaints get mixed together:
- Hums, no spin: motor, capacitor, bearings, or a locked impeller. This page.
- Spins, no water: suction-side air, baskets, or a blocked impeller after it has already started. See pool pump won’t prime.
- Runs and wets the pad: shaft seal or a fitting. See standing water at the equipment pad and pump leaking water.
The specialist we connect you with tests rather than guessing from the sound. A capacitor can fail while the motor is still good. Debris in the impeller can look like a dead motor until the wet end is opened. Bearings that have seized are a motor job.
What to record before the visit
Write down the pump brand and model from the motor label, whether it is single-speed or variable-speed, whether the breaker trips, and whether you smell heat. Photograph the pad so the specialist sees clearance around the motor fan cover. Coastal pads in Oceanside or Imperial Beach often show corroded electrical covers. Inland pads in Escondido see more heat on the motor can. Those notes change the inspection. They do not set a published price.
HomeGuide lists general pump repair planning at $50 to $650. HomeGuide’s pump cost guide lists variable-speed units at $700 to $1,600 and installed work at $800 to $2,000. Plumbing or electrical changes can add to installation. Those are planning estimates, not this brand’s quote.
If your San Diego pool pump hums and will not spin, call Refresh Pool Pros at (858) 400-4598 and we will connect you with a licensed independent specialist. Leave the power off until they test it.
Frequently asked questions
Why does my pool pump hum but not start?
A hum with no rotation usually means the motor is energized but the shaft is not turning. Common causes a specialist tests are a failed capacitor, a seized bearing, or an impeller locked with debris. It is not the same problem as a pump that spins and will not prime.
Should I keep resetting the breaker?
No. If the motor hums, trips, or smells hot, shut it off. Repeated starts can finish a motor that might have been a capacitor or impeller job.
Is this the same as a pump that will not prime?
No. Priming problems show a spinning motor and empty or half-full basket. Humming with no spin is the motor. Use [pool pump won't prime](/blog/pool-pump-wont-prime-san-diego/) for air leaks and baskets.
How much does pump repair cost?
HomeGuide publishes a general U.S. pump repair planning estimate of $50 to $650. A motor replacement or a full pump swap can sit outside that band. The specialist quotes after testing this pump. See [HomeGuide's pool repair cost guide](https://homeguide.com/costs/pool-repair-cost).
Repair the motor or replace the pump?
Record the model, whether it is single-speed or variable-speed, and the symptom. If the wet end is also aged, replacement may be the cleaner scope. HomeGuide lists variable-speed pumps at $700 to $1,600 unit only and $800 to $2,000 installed as general planning estimates.
Need professional help in San Diego County?
Refresh Pool Pros connects you with a licensed specialist for any service in this post.