I've noticed that when the temps are cooler (at least I believe it's only when cooler), maybe sub 55 degrees, my pump emits this odd scratchy sound. The hum/running sound of the motor seems fine and consistent, but this is an additive noise sometimes. No idea what it is, or if it could be the sign of a soon to die bearing or something. System is only 3 years old. Again, no extra noise when the temps are higher. Anything to worry about?
Here's a clip of the sound. Listen for he inconsistent sound - the scratchy, leaf ruffling sound, or like a can with sand in it is being shaken vigorously...
Pump Sound Clip
Thanks for the help!