Stihl Air Lock / Intake Blockage in Solution System

No water or solution dispenses from any outlet, but the pump can be heard running

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Possible Causes

Air trapped in solution line, clogged solution intake filter, collapsed solution hose, empty or improperly seated tank

How to Fix / Troubleshooting

Safety: Keep the unit unplugged while checking filters and hoses.

  • Confirm tank fill and seating: Fill the clean solution tank and ensure it is locked into place correctly.
  • Prime the system: Plug in, then hold the trigger continuously for 30–60 seconds over a sink or bucket to purge air.
  • Clean intake filter: Remove and rinse the filter at the tank outlet or pump inlet.
  • Inspect hoses: Look for flattened or kinked hoses between tank, pump, and outlets. Replace any that remain collapsed.
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Repair Difficulty

Easy 2/5

Required Part

Solution Inlet Filter
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