Strong Spas Heater Manifold or Plumbing Leak

Water is leaking from the equipment bay under the control pack or heater

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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

Cracked heater manifold from freeze or dry fire, Loose heater unions, Failed O-rings on unions or sensors, Split PVC plumbing fittings

How to Fix / Troubleshooting

Safety first: Turn off power at the GFCI breaker and do not run the spa with an active leak near electrical components.

Steps to locate and address leaks:

  • Identify leak source: Remove the equipment-side panel and use a flashlight to trace water back to its highest visible point.
  • Check heater unions: Tighten heater unions by hand, then an additional quarter-turn with a strap wrench if needed. Do not overtighten.
  • Inspect O-rings and sensors: If water appears around sensor wells or unions, drain the spa below the leak, disassemble the fitting, and replace O-rings or gaskets.
  • Assess manifold: Cracks in the heater manifold or plumbing fittings usually require replacement of the affected part.

When to call a technician: For major plumbing repairs or if the leak is behind foam insulation, professional service is recommended.

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Repair Difficulty

Hard 4/5

Required Part

Heater Manifold
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