Fafco
Solar Booster Pump Mechanical Wear or Cavitation
Solar pump is very noisy, vibrates, or runs hot when feeding Fafco panels.
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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
Air entrainment causing cavitation, Worn pump bearings, Impeller partially blocked, Pump oversized or undersized for Fafco array head
How to Fix / Troubleshooting
Safety: Turn off power before touching the pump or opening the housing.
- Check for air: Ensure the pump is fully primed and that suction-side fittings are airtight. Fix any leaks that allow air into the pump.
- Inspect impeller: Remove the pump housing (per manufacturer instructions) and check for debris in the impeller. Clean thoroughly.
- Listen to bearings: A grinding or screeching noise indicates bearing failure; the pump motor may need replacement.
- Verify sizing: Confirm the pump is correctly sized for the Fafco panel height and flow requirements. Replace with a properly sized unit if necessary.
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Repair Difficulty
Medium
3/5
Required Part
Fafco Solar Booster Pump
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