Fafco Manifold Union or Gasket Leak

Water leaks at the equipment pad around the Fafco solar manifold when solar is on.

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Possible Causes

Loose union on Fafco solar manifold, Flattened or missing union O-ring, Cracked manifold body, Over-tightened fitting causing stress crack

How to Fix / Troubleshooting

Safety: Turn off pump and relieve pressure before loosening unions.

  • Identify leak point: Dry the area and run the system briefly to see exactly where water emerges.
  • Tighten unions: Hand-tighten the leaking union, then add a small additional turn with a strap wrench if needed. Do not overtighten.
  • Inspect O-rings: If tightening fails, open the union and inspect the O-ring. Replace if flattened, cracked, or missing.
  • Check for cracks: Examine the manifold body for hairline cracks. Replace the manifold if damaged.
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Repair Difficulty

Easy 2/5

Required Part

Fafco Solar Manifold O-Ring Kit
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