Pahlén pool pump is very loud with a high-pitched whine, especially on variable-speed models

Safety first: No internal electrical work should be done with power on.

• Check bearings: With power off, rotate the shaft by hand. Roughness indicates bearing wear that should be addressed.
• Adjust speed: Slightly change the programmed speeds on the Pahlén variable-speed pump to avoid resonance frequencies that cause whining.
• Isolate mounting: Install rubber isolation pads under the pump base to reduce transmitted noise.
• Consult settings: If accessible, adjust drive parameters (such as switching frequency) per Pahlén guidance to minimize audible noise.