Moccamaster Steam Venting or Seal Leakage

Steam escaping from top cover or around outlet arm

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Possible Causes

Outlet arm not seated properly, Cracked or missing outlet arm grommet, Blocked outlet arm holes, Warped top cover

How to Fix / Troubleshooting

Safety: Steam can cause burns. Allow the unit to cool before touching the top area.

  • Check outlet arm seating: Ensure the outlet arm is fully inserted into its socket and correctly oriented over the brew basket.
  • Clean outlet arm: Remove and clean the outlet arm, clearing any blocked holes that may force steam out of joints.
  • Inspect grommet/seal: Examine the rubber grommet or seal where the outlet arm enters the top cover. Replace if cracked, hardened, or missing.
  • Check top cover: If the top cover is warped and not sealing properly, replace the cover to prevent steam leaks.
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Repair Difficulty

Very Easy 1/5

Required Part

Outlet Arm Grommet
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