Marquis Spas Worn Pump Bearings or Cavitation

Spa makes loud grinding or squealing noise from pump area during operation.

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

Failed motor bearings, Pump running dry or with air, Misaligned pump mounting, Debris in impeller

Safety first: Turn off power at the GFCI breaker.

Identify source: Remove the equipment bay door and run the spa briefly to pinpoint which pump is noisy (do this only if safe and dry).
Check for air: Bleed air from the noisy pump's unions to ensure it is not cavitating.
Inspect mounting: Ensure the pump is securely bolted to its base and not vibrating against the cabinet.
Assess bearings: If the noise is a high-pitched squeal or grinding that persists, the motor bearings are likely worn. The pump motor should be replaced or rebuilt.

Medium 3/5

Marquis Jet Pump Motor Assembly

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