Spa cabinet or shell vibrates excessively and makes loud banging or rattling noises during jet operation.

Safety first: Turn off power at the GFCI breaker before tightening or adjusting pumps.

• 1. Inspect pump mounts: Check that all Coleman pump mounting bolts are tight and that rubber isolation pads are in place.
• 2. Check plumbing support: Ensure PVC plumbing is properly supported and not putting stress on pump unions.
• 3. Bleed air: Remove air from the pump by loosening unions until water flows steadily, then retighten.
• 4. Bearing noise: If the motor makes a grinding or high-pitched whine, the bearings are likely worn and the motor or pump should be replaced.