Bosch Solution Valve Not Sealing

Unit drips solution from nozzle when not pressing trigger

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Possible Causes

Worn solution valve seal, Debris in valve seat, Sticking trigger mechanism, Overfilled solution tank causing excess pressure

How to Fix / Troubleshooting

Safety first: Unplug the unit and empty the solution tank before working on the valve.

  • 1. Check fill level
    • Ensure the clean water/solution tank is not filled above the maximum mark.
  • 2. Clean solution valve
    • Remove the tank and locate the outlet valve and corresponding inlet on the machine.
    • Rinse both with warm water to remove detergent residue.
    • Inspect the rubber seal for damage; replace if worn.
  • 3. Inspect trigger and internal valve
    • Access the internal solution valve actuated by the trigger.
    • Check for debris preventing full closure and clean as needed.
    • If the valve spring is weak or seal damaged, replace the valve assembly.
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Repair Difficulty

Easy 2/5

Required Part

Solution Valve Assembly
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