Spa vibrates excessively or rattles when pump is running.

Safety first: Turn off power before tightening or adjusting any components.

• Check mounting: Inspect the pump mounting bolts and rubber pads. Tighten bolts and replace worn pads.
• Support plumbing: Add supports or straps to long plumbing runs to reduce stress on the pump unions.
• Bleed air: Remove air from the pump as described in air-lock procedures.
• Test with cabinet on: Some vibration noise is reduced when the cabinet panels are reinstalled properly.