Lay-Z-Spa makes loud humming, grinding, or rattling noises during filtration or heating.

Safety first: Unplug the spa before removing the pump or filter housing.

• 1. Check for air in system: Bleed air by loosening the filter housing cap slightly, then retighten and run filter mode. Air can cause rattling and cavitation noises.
• 2. Clean filter and ports: Remove and clean/replace the filter cartridge. Inspect inlet/outlet ports for debris that could reach the impeller.
• 3. Isolate vibration: Place a rubber mat or foam pad under the pump unit to reduce noise transmission to the ground.
• 4. Listen closely: If grinding persists, the pump bearings or impeller may be worn.
• Next steps: Internal pump repairs require disassembly of the sealed unit and should be done by a professional. Consider replacing the pump/heater unit if noise is severe.