Aqmos Control Valve Head Leak

Water leaks from around the control head on top of the resin tank

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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

Damaged O-ring between valve and tank, Cracked valve body, Over-tightened plumbing stressing the head, Freeze damage

How to Fix / Troubleshooting

Safety: Turn off water supply, place the unit in bypass, and depressurize by opening a tap.

  • Locate leak: Dry the area and observe where water emerges—at the tank/valve joint, fittings, or cracks.
  • Check fittings: Tighten inlet/outlet fittings gently. Do not overtighten plastic threads.
  • Inspect tank O-ring: If leaking at the tank neck, remove the control head, inspect and replace the large O-ring, and clean mating surfaces.
  • Check for cracks: Examine the valve body for hairline cracks, especially if the unit experienced freezing. Replace the valve head if cracked.
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Repair Difficulty

Medium 3/5

Required Part

Valve-to-Tank O-ring / Control Valve Head
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