Tristar Reservoir Seal / Valve Leak

Water leaks from around the water reservoir area onto the counter.

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Possible Causes

Worn reservoir outlet O-ring, Debris on tank valve, Cracked reservoir body, Damaged tank docking seal on base

How to Fix / Troubleshooting

Safety first: Unplug the unit and remove the reservoir.

  • Clean outlet valve: Rinse the bottom valve of the Tristar tank under warm water. Use a soft brush to remove coffee grounds or scale.
  • Inspect O-rings: Check the rubber O-ring(s) around the outlet. If flattened, cracked, or missing, replace them with food-grade O-rings of the same size.
  • Check base seal: Inspect the seal or grommet where the tank sits on the machine. Clean and replace if torn or deformed.
  • Test for cracks: Fill the tank and set it on a dry towel off the machine. If it leaks, the tank itself must be replaced.

Note: Always seat the reservoir firmly to ensure a proper seal.

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Repair Difficulty

Easy 2/5

Required Part

Water Reservoir and Outlet O-Ring
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