How to Fix / Troubleshooting

Safety first: Unplug the spa before inspection. Keep hands away from moving parts.

Check for debris: Remove the filter and inspect suction/return ports for stones, plastic, or other objects.
Listen closely: Determine if the noise occurs only when the pump runs (filtration/heating) or also when bubbles are on (blower).
Flush system: Drain and flush the spa to remove any hidden debris.
Monitor: If noise persists but flow is strong, the pump bearings may be wearing. Continued use can lead to failure.
Replace pump module: Replace the internal pump or entire pump/heater unit to restore quiet operation.

Warning: Ignoring grinding noises can lead to sudden pump seizure and potential overheating.

Rattling or grinding noise from pump/heater unit during filtration or heating.

Possible Causes