Stihl Air Leak / Suction Path Restriction

Very weak suction at the floor head; unit sounds normal but does not pick up much water

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Possible Causes

Loose hose connections, damaged suction hose, clogged intake at floor nozzle, mis-seated recovery tank lid

How to Fix / Troubleshooting

Safety: Unplug the cleaner before inspecting hoses.

  • Check tank seating: Ensure the recovery tank and lid are fully seated and latched. Even a small gap will drastically reduce suction.
  • Inspect suction hose: Remove the hose from both ends and check for splits, holes, or kinks. Replace if damaged.
  • Clean floor nozzle: Flip the floor head over and remove any lint, hair, or debris blocking the suction slot. Some models have a removable nozzle plate for easier cleaning.
  • Seal checks: Inspect all rubber seals and O-rings in the suction path. Replace any that are flattened or cracked.
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Repair Difficulty

Easy 2/5

Required Part

Suction Hose
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