Pump runs but makes a high-pitched whine, especially at certain speeds on a variable-speed Hurlcon pump.

Safety: Keep clear of moving parts while the pump is running.

• Check mounting: Ensure the pump is securely mounted and that the base is not acting as a sounding board. Add rubber pads if necessary.
• Adjust speed: Slightly change the programmed speed to move away from the resonant frequency.
• Inspect for loose parts: Check motor fan cover, terminal box, and controller housing for loose screws.

If the whine is excessive or accompanied by overheating, have the Hurlcon drive and motor checked.