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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