PDC Spas Worn circulation pump bearings or cavitation

Circulation pump is noisy, rattling, or grinding during operation.

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Safety Warning

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.

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Possible Causes

Aging circulation pump motor, Air in suction line causing cavitation, Debris in pump impeller, Pump mounted loosely to equipment base

How to Fix / Troubleshooting

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

  • 1. Check for air: Bleed air from the circulation pump by loosening the union until water seeps out, then retighten.
  • 2. Inspect mounting: Ensure the pump is firmly secured to the equipment base and that rubber isolation mounts are intact.
  • 3. Listen after bleeding: Restore power and listen. If noise persists and sounds like grinding, the pump bearings are likely worn.
  • 4. Plan replacement: Replace the circulation pump with a PDC Spas-compatible circulation pump assembly. This typically involves disconnecting unions and electrical leads and swapping the pump.

Operating a noisy pump until failure can lead to leaks or electrical damage; schedule replacement promptly.

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Repair Difficulty

Medium 3/5

Required Part

PDC Spas circulation pump
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