Bunn Internal Leak / Tank or Tubing Failure

Bunn coffee maker leaks water from the bottom of the unit during or after brewing.

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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 silicone tubing, Loose hose clamp, Leaking tank gasket, Corroded or cracked hot water tank

How to Fix / Troubleshooting

Safety: Unplug the brewer immediately. Hot water leaks can cause burns and electrical shock hazards.

Steps:

  • 1. Remove exterior panels: With the unit cool and unplugged, remove the side or bottom panels to inspect the internal plumbing.
  • 2. Identify leak source: Fill the tank with cold water and observe where water appears. Look closely at tubing connections, tank seams, and valves.
  • 3. Tighten or replace clamps: If water seeps from a hose connection, tighten the clamp or replace it with a new stainless-steel clamp. Ensure the tubing is fully seated on the barb.
  • 4. Replace cracked tubing: Any silicone or vinyl tubing that is brittle, discolored, or cracked should be replaced with high-temperature food-grade tubing of the same size.
  • 5. Tank leaks: If water is leaking from a weld seam or fitting on the stainless tank, the tank assembly will usually need replacement. Do not attempt to weld or epoxy the tank.

Warning: Do not operate the brewer with an active leak; water can reach live electrical parts.

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Repair Difficulty

Hard 4/5

Required Part

Silicone Water Tubing
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