Samsung dishwasher has a bad smell: What to Check and What to Do Next

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Turn the dishwasher off and identify the odor without putting your face inside: note whether it is musty or food-like, sewage-like near the sink, burning or electrical, chemical, or accompanied by smoke, a leak, or unusual heat.

   Expected result: The smell is musty or food-like, strongest at the sink connection, burning or electrical, chemical or gas-like, or paired with smoke, heat, or water.

   Next step: For a routine odor, continue with the cool, off cleaning checks. For a hazardous or uncertain odor, keep the dishwasher off, ventilate only if safe, and arrange qualified service or appropriate emergency help.

   Stop if: Stop immediately for smoke, sparks, burning odor, gas-like odor, uncontrolled water, or water near electrical parts.

   Why this matters

   Why: Musty or food odor usually points to moisture and debris. Sink-side sewage odor points toward household plumbing. Burning, chemical, gas-like odor, smoke, heat, or a leak is a safety boundary and not a cleaning diagnosis.

2. Check 2

   With the dishwasher off, remove the lower rack and inspect the model-accessible filter, filter housing, drain area, and spray-nozzle holes; remove visible food or grease and clean removable parts only as the manual describes.

   Expected result: The filter or drain area contains food or grease, nozzle holes are blocked, the model has no removable filter, or the accessible areas are clean.

   Next step: Rinse and refit removable parts in the exact order shown in the manual. If no filter is removable, wipe the reachable drain area and do not open a pump or cabinet panel.

   Stop if: Use caution around sharp debris; do not reach into a hidden pump, remove sealed panels, or force a filter or nozzle.

   Why this matters

   Why: Debris in the filter, drain area, or nozzles can retain moisture and create odor while also reducing cleaning and drainage. A clean accessible path makes the door seal, inner door, connected drain, or an internal drain problem more likely.

3. Check 3

   Wipe the door seal, bottom edge of the door, inner door, tub surfaces, racks, and removable accessories with the model-approved mild cleaning method; remove trapped residue and dry the areas afterward.

   Expected result: Residue or slime is present at the seal or door edge, plastic racks or accessories smell, the inner tub has film, or all reachable surfaces are clean.

   Next step: Refit all parts correctly and leave the door slightly open after use. Do not use bleach in a stainless-steel interior, and do not combine vinegar with detergent or another cleaning agent.

   Stop if: Do not use harsh or abrasive chemicals, spray liquid into controls, or clean while the dishwasher is hot or energized.

   Why this matters

   Why: Food residue and retained moisture at the seal, door edge, racks, and tub can produce a musty smell even when the filter looks clean. A clean interior with recurring odor shifts attention to drain backflow, standing water, or a service issue.

4. Check 4

   After a prior cycle has ended and the unit is safe to inspect, look for a large amount of water in the tub and check whether the odor is strongest at the sink, air gap, garbage disposal, or drain-hose connection; run water in the connected sink and see whether it drains freely.

   Expected result: A large amount of water remains, the dishwasher shows a drain error or blinking lights, the sink or disposal backs up, the drain hose is kinked or lacks the required high loop or air gap, or the sink drains normally.

   Next step: Correct only a visible hose kink or model-documented connection issue. Arrange plumbing help when the sink or disposal backs up, and appliance service when the dishwasher remains full after the external path is clear.

   Stop if: Do not detach a water-filled hose without safe containment, pour chemical drain cleaner into the dishwasher, or open the pump or cabinet.

   Why this matters

   Why: Standing water or a drain error can sustain odor and points to the dishwasher drain path. Sink backup or a poor connection points to household plumbing or installation. A normal sink and clear visible connection make a filter, pump, internal hose, or seal issue more likely.

5. Check 5

   When the filter and drain area are correctly reassembled and the dishwasher can drain, run the model's empty Self Clean, Normal, or other documented cleaning cycle with one approved cleaning agent; do not combine agents.

   Expected result: The cycle drains and the odor clears, debris or agent remains afterward, the cycle cannot drain, an error appears, or the odor is unchanged.

   Next step: Wipe away any residue, dry the interior, and leave the door slightly open. If the cycle cannot drain or the odor persists, stop repeating cleaning cycles and arrange the appropriate appliance or plumbing service.

   Stop if: Do not use bleach in a stainless-steel interior, mix vinegar with detergent or another agent, run a cleaning cycle with dishes, or continue if smoke, burning odor, leak, or fault appears.

   Why this matters

   Why: A clear cycle with a resolved odor supports an interior maintenance cause. Residue, a failed drain, an error, or unchanged odor indicates that cleaning did not address the source and may point to drain, backflow, seal, or internal service trouble.

6. Check 6

   After cleaning, remove dishes promptly, wipe the inner door and accessible damp areas, leave the door slightly open when idle, and observe the next normal cycle for odor, standing water, a leak, or an error.

   Expected result: The odor stays gone, returns only after dirty dishes sit, returns with standing water or sink backup, or returns with a leak, fault, or abnormal smell.

   Next step: Continue the documented drying and filter routine for a resolved maintenance odor. Arrange plumbing or appliance service for recurring drainage or leakage, and stop using the unit for hazardous smells or faults.

   Stop if: Do not keep running cycles to mask an odor, leave a leaking or faulted dishwasher unattended, or replace a pump, hose, or seal without diagnosis.

   Why this matters

   Why: An odor that follows stored dirty dishes or retained moisture supports a maintenance cause. Odor with standing water or sink backup indicates drainage or plumbing. A leak, fault, burning, chemical, or gas-like smell requires service rather than more cleaning.