Bunn Microbial Growth / Poor Sanitation

Bunn coffee maker emits a moldy or musty odor from the tank or brew area.

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Possible Causes

Stagnant water in tank, Infrequent cleaning, Dirty carafe and funnel, Mold in reservoir or lid

How to Fix / Troubleshooting

Safety: Unplug the brewer before cleaning. Avoid inhaling mold spores; clean in a well-ventilated area.

Steps:

  • 1. Empty and rinse: Drain or flush the internal tank with fresh water if possible. Empty and wash the carafe and funnel.
  • 2. Clean with mild detergent: Wash all removable parts with hot, soapy water. Scrub any visible mold or residue.
  • 3. Sanitize: Run a brew cycle with a solution of 1 part white vinegar to 2 parts water. Let it sit in the tank for 15–20 minutes, then flush with several tanks of fresh water.
  • 4. Dry between uses: Leave the lid or reservoir cap slightly open when not in use to allow ventilation and reduce moisture buildup.
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Repair Difficulty

Very Easy 1/5
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