DeWalt Biological Growth in Tank / Filter

Vacuum smells musty or moldy when turned on

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Possible Causes

Stored with wet debris inside, Wet filter not dried before storage, Tank not cleaned after wet pickup

How to Fix / Troubleshooting

Safety: Remove the battery and wear gloves and a mask when cleaning moldy components.

  • Empty and clean tank: Wash the tank or canister with mild detergent and warm water. Rinse thoroughly and dry completely.
  • Replace filters: Discard and replace any filters that have visible mold or persistent odor.
  • Dry thoroughly: Allow all parts to dry in a well-ventilated area before reassembly.
  • Prevent recurrence: After wet use, always empty and dry the tank and filters before storage.
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Repair Difficulty

Very Easy 1/5

Required Part

Main Filter Cartridge
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