Oster Overflow / Brew Basket Drain Restriction

Water or coffee leaks from around the top of the carafe or filter basket during brewing.

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Possible Causes

Clogged filter basket outlet, Drip-stop valve stuck closed, Using too fine a grind or too much coffee, Carafe misaligned under brew basket

How to Fix / Troubleshooting

Safety first: Use caution around hot coffee and steam. Turn the unit off and unplug before cleaning.

Check coffee load and grind:

  • Ensure you are not exceeding the recommended amount of coffee grounds for the selected brew size.
  • Avoid very fine espresso grinds; use a medium grind suitable for drip coffee.

Clean the brew basket and drip-stop:

  • Remove the filter basket and wash it thoroughly with warm soapy water.
  • Inspect the outlet hole and drip-stop mechanism for clogs; clear any coffee buildup.
  • Operate the drip-stop plunger by hand to ensure it moves freely.

Carafe alignment:

  • Make sure the carafe is centered and pushed fully back so the brew stream enters the carafe opening.

If overflow continues despite proper loading and a clean basket, the drip-stop valve or brew basket may be warped or damaged and require replacement.

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Repair Difficulty

Easy 2/5

Required Part

Brew Basket with Drip-Stop Valve
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