Pool pump motor humming

[Poolworx]

Hi all

Back in July last year I installed a new pool pump/motor. The problem is it's now making a humming noise and trips the breaker.

I initially thought it was the capacitor, but opened up the back to find there is no capacitor. Didi a little research and thought maybe it was a shaded pole motor. But what was causing the symptoms could be a pitted centrifugal switch, a bad start winding. I'm not sure

Any advice would be appreciated

Thanks

 

[Poolworx]

I'm wondering if the shorting of the windings could have been caused by a Gecko crawling in through the cooling vents could have caused it

 

[Lucien Nunes]

On a newish motor not rusted out or mechanically damaged, winding damage is most likely to result from overheating. That in turn is likely to result from centrifugal switch failure, mechanical stalling or stifled ventilation. If it's free to turn and was not covered by a duvet, I would think the switch the most likely culprit.