Why is my Bosch dishwasher leaking?
Dishwasher leaks usually stem from worn seals, blocked drains, or loose connections. This guide helps you identify the source in 15 minutes.
Most likely causes
- 35% Worn or damaged door seal (gasket) allowing water to escape during the wash cycle.
- 25% Blocked drain filter or kinked drain hose restricting water flow and causing backup leaks.
- 20% Cracked or loose inlet hose connection at the back of the machine or water inlet valve failure.
- 15% Faulty pump seal or internal pump damage leaking water during operation.
- 5% Cracks in the tub or housing from impact damage.
How to diagnose it
- 1
Check door seal condition
Open the door and inspect the rubber gasket around the edge for visible cracks, splits, or hardening. Run your finger around it—it should feel flexible and have no gaps.
💡 Look especially at the bottom corners where seals wear fastest.
- 2
Examine drain filter access
Locate the drain filter at the bottom of the tub (usually bottom right). Unscrew it and check for food debris, detergent buildup, or blockages. Empty any contents.
💡 A blocked filter forces water backward and can leak from the door seal.
- 3
Inspect drain hose routing
Follow the drain hose from the back of the dishwasher to where it connects to your kitchen plumbing. Look for kinks, cracks, or loose connection points. Straighten any kinks gently.
💡 Leaks here typically appear under or behind the machine.
- 4
Check inlet hose connections
Turn off the water supply tap behind the dishwasher. Inspect both ends of the inlet hose for cracks or loose connections. Tighten any connection by hand, then a quarter turn with a spanner.
💡 Inlet leaks appear at the back wall and happen immediately when the cycle starts.
- 5
Run a short test cycle
Empty the dishwasher, close the door, and run a 10-minute rinse cycle. Place a tray underneath to catch any leaks and observe where water appears.
💡 Note the leak location—this tells you which component needs repair.
- 6
Assess internal pump access
If no external leaks are visible, the pump seal may be faulty. This requires removing the bottom panel—consult your model's manual or contact Bosch support for guidance.
💡 Pump repairs usually need professional help or part replacement.