{"id":7650,"date":"2026-09-01T16:57:26","date_gmt":"2026-09-01T14:57:26","guid":{"rendered":"https:\/\/trypool.com\/?p=7650"},"modified":"2026-09-01T16:57:30","modified_gmt":"2026-09-01T14:57:30","slug":"my-swimming-pool-pump-is-making-a-noise-but-wont-start","status":"publish","type":"post","link":"https:\/\/trypool.com\/en\/blog\/la-bomba-de-mi-piscina-hace-ruido-pero-no-arranca\/","title":{"rendered":"My swimming pool pump is making a noise but won\u2019t start"},"content":{"rendered":"

Is the swimming pool pump making a noise but not starting?<\/h1>\n\n\n\n

Does the swimming pool pump make a loud humming noise, as if it were trying to start, but the motor doesn\u2019t actually start and the water isn\u2019t circulating?<\/p>\n\n\n\n

\"A<\/figure>\n\n\n\n

This symptom usually indicates that the motor is receiving power, but a mechanical or electrical fault is preventing the shaft from starting to turn. The first two possibilities to check are a blockage in the shaft or the impeller, and a fault with the motor\u2019s capacitor.<\/p>\n\n\n\n

In this guide, we explain how to tell the difference between the two faults, what checks can be carried out, and when it is necessary to remove the engine or contact a repair service.<\/p>\n\n\n\n

\n

Quick diagnosis:<\/strong> If the pump hums but does not start, it must be switched off immediately. With the power off, check whether the shaft turns. If it is seized, there is probably a mechanical fault. If it turns freely, the capacitor is one of the first components to check.<\/p>\n<\/blockquote>\n\n\n\n

What does the humming noise from the pump mean?<\/h2>\n\n\n\n

The humming sound indicates that the motor is trying to start. However, the rotating assembly does not begin to move and, therefore, the impeller cannot generate water flow.<\/p>\n\n\n\n

The pump must not be left switched on whilst waiting for it to start up. If the motor remains powered whilst the shaft is stationary, its temperature may rise and the fault may be exacerbated.<\/p>\n\n\n\n

The most common causes are:<\/p>\n\n\n\n

Symptom observed<\/th>Possible cause<\/th><\/tr>
Loud humming noise and seized shaft<\/td>Clogged impeller, seized bearings or mechanical jam<\/td><\/tr>
A buzzing sound and a freely rotating shaft<\/td>Faulty capacitor or electrical fault<\/td><\/tr>
A metallic clanking or scraping noise<\/td>Worn bearings<\/td><\/tr>
Triggering of the motor protection device or protection<\/td>Overload, winding, wiring or shunt<\/td><\/tr>
The motor is running, but it isn\u2019t pumping any water<\/td>Failure to prime, air ingress, valve closed or hydraulic problem<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Before replacing the pump, it is important to determine whether the problem lies with the motor, the hydraulics or the electrical system.<\/p>\n\n\n\n

Safety before checking the pump<\/h2>\n\n\n\n

Before handling the equipment:<\/p>\n\n\n\n