Pentair Intelliflo variable speed pump turns louder (it is about 50% more sound, but quite noticeable since it is not like normal pump motor white noise, but more like "grinding" sound or with some tones (no high pitch tho), or like the sound when pump runs at much higher speed.
Pump is set to run 1850 rpm daytime.
The louder sound follows very regular timing, the pump is quieter for every 6 minutes, and then turns louder for 2 minutes, over and over again and keeps accurate timing pattern.
What could cause this?A gradually broken bearing? Or some leakage triggers auto-priming periodically?
The pump is set to be very low speed after 11pm night time. But even after it lowers rpm at night, the same periodical loader sound happens in the same time pattern. and it is much more noticeable than daytime since at night it only runs like 1000 rpm and very quiet. But like daytime, every 6 minutes it turns as louder as the same level of day time and lasts for 2 minutes before it turns quiet again. over and over again.
Thanks a lot for any help for this mysterious behavior of the pump!
Pump is set to run 1850 rpm daytime.
The louder sound follows very regular timing, the pump is quieter for every 6 minutes, and then turns louder for 2 minutes, over and over again and keeps accurate timing pattern.
What could cause this?A gradually broken bearing? Or some leakage triggers auto-priming periodically?
The pump is set to be very low speed after 11pm night time. But even after it lowers rpm at night, the same periodical loader sound happens in the same time pattern. and it is much more noticeable than daytime since at night it only runs like 1000 rpm and very quiet. But like daytime, every 6 minutes it turns as louder as the same level of day time and lasts for 2 minutes before it turns quiet again. over and over again.
Thanks a lot for any help for this mysterious behavior of the pump!