Medisana Water Tank or Base Seal Leakage

Humidifier leaks water onto the table or floor.

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Possible Causes

Cracked water tank, Worn or mis-seated tank cap gasket, Damaged base O-ring around tank inlet, Overfilling or tilting the unit during operation

How to Fix / Troubleshooting

Safety: Unplug the humidifier immediately if water is leaking near electrical parts.

  • Inspect tank: Remove the tank, dry it, and inspect for hairline cracks, especially around the handle and bottom valve. Replace the tank if cracked.
  • Check cap gasket: Unscrew the tank cap/valve. Examine the rubber gasket or O-ring for deformation, cracks, or dirt. Clean it and the sealing surfaces; replace the gasket if worn.
  • Base seal: Inspect the rubber seal in the base where the tank sits. Ensure it is not torn or missing. Replace the base O-ring if damaged.
  • Level placement: Place the unit on a flat, level surface and avoid moving it while full.
  • Test for leaks: Refill and observe for leaks before reconnecting power.
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Repair Difficulty

Easy 2/5

Required Part

Water Tank Cap Gasket
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