Reduce incoming use
Stop using the connected fixtures while arranging suitable assessment. State whether the unit is still running or has been isolated through its ordinary accessible control.
Keep the sequence
Describe the fixture used, unusual noise and whether water level rose. A professional can assess a restriction or control issue without asking you to recreate an overflow.
A useful distinction
Tell us whether the sound is normal pumping or an unfamiliar hum, but do not open the enclosure to improve the recording. The final state is sufficient for screening an urgent existing-equipment enquiry.