Caldera Spas Pump Bearing or Cavitation Noise

The spa makes loud grinding, squealing, or rattling noises when pumps are running.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Worn pump motor bearings, air in the pump causing cavitation, debris in the pump impeller, pump mounted loosely to the base.

Safety first: Turn off power at the GFCI breaker before touching the pump.

Check for air: Bleed air from pump unions and ensure the water level is adequate. Air in the pump can cause loud cavitation noises.
Inspect mounting: Verify that the pump is securely bolted to the equipment base and that rubber isolation mounts are intact.
Debris check: Remove the pump wet end (with the spa drained or lines clamped) and inspect the impeller for debris or damage.
Replace pump: If the motor bearings are noisy or rough when spun by hand, replace the pump motor or the complete pump assembly.

Hard 4/5

Jet Pump Assembly

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