My response will give you a bump, but it might also help to add some information such as what RPMs you're using at the various speeds, which speeds seem unusual, or anything else you can think of.
We run the pump in the morning for 2 hours at 2850 rpms. Then again for 3 hours in the afternoon at 2200 rpms. The pool sweep runs for one hour also at the afternoon run. This was the instructions from our installer. Both seem way to loud.
If the pump is only a few weeks old, I suggest you call the installer and have them come out and look at it. It should not be so noisy that it bothers you...
Here are some possibilities:
1) Cavitation. Excessive suction due to speeds too fast for the suction plumbing to feed the pump.
2) Cavitation due to clogged lines or valves closed. To check for cavitation, get a vacuum gauge and install it in the front drain plug.
3) Bad bearings.
4) Fan whine. At high speeds, the back mounted fan can get a little noisy. To check, cover back fan cover to see if sound changes. Only block for a few seconds. Don't use anything that can get sucked into the fan.
5) Rocks in the impeller. Check pump basket for small rocks.
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