Spa vibrates excessively or makes thumping noises when jets are on.

Safety first: Turn off power before adjusting pump mounts or plumbing.

• Inspect pump mounts: Check that all mounting bolts are tight and that rubber isolation pads are present and intact under the pump feet.
• Reposition plumbing: Ensure flexible hoses and PVC pipes are not pressed tightly against the cabinet or shell. Add foam or padding where needed.
• Level spa: Confirm the spa is level and fully supported on its base to reduce resonance.