The short answer
Odour in a Blomberg dishwasher collects in three places: the filter stack, the door gasket, and the drain hose. Low-temperature eco programmes, which this platform favours, never get hot enough to lift fat off the tub and the arms, so the smell builds steadily on machines that are used correctly in every other way. All of it is owner-fixable, none of it needs a part, and the habit that prevents it costs nothing.
What you are seeing
- A sour or stale smell when the door is first opened
- A drain-like smell that is strongest at the sink
- Grey or pink film on the filter, the gasket or the tub floor
- Clean dishes that pick up a smell after standing in the machine
- A smell that returns within days of cleaning
- A near-miss symptom: a hot or burnt-plastic smell, which is an electrical warning and belongs on the electrical safety page
- Body: Where you smell it points at which of the three: A sour or stale smell when the door is first opened. A drain-like smell that is strongest at the sink. Grey or pink film on the filter, the gasket or the tub floor. Clean dishes that pick up a smell after standing in the machine. A smell that returns within days of cleaning. A near-miss symptom: a hot or burnt-plastic smell, which is an electrical warning and belongs on the electrical safety page.
Causes, most likely first
- A loaded filter stack — Why: three filters in series catch everything the machine removes, and the micro screen holds fat that never washes off in a low-temperature cycle.
- Biofilm in the door gasket channel — Why: the gasket is out of the spray path entirely, so nothing cleans it but a cloth, and the bottom corners collect the worst of it.
- Exclusive use of low-temperature eco programmes — Why: these cycles are excellent for energy and poor at removing fat, so residue accumulates on the tub, the arms and the hose over months.
- A drain hose without a high loop — Why: a hose that runs flat lets sink water and trap gas sit against the machine, which is the smell that is worse at the sink.
- A door closed immediately after every cycle — Why: a sealed damp tub is exactly the condition biofilm needs, and leaving the door ajar prevents more odour than any cleaner removes.
- A neglected spray arm — Why: the jets and the inside of the arms hold residue that seeds the smell again after the tub itself is cleaned.
- Body: Ranked by how much standing residue each place holds: First, A loaded filter stack: three filters in series catch everything the machine removes, and the micro screen holds fat that never washes off in a low-temperature cycle. Second, Biofilm in the door gasket channel: the gasket is out of the spray path entirely, so nothing cleans it but a cloth, and the bottom corners collect the worst of it. Third, Exclusive use of low-temperature eco programmes: these cycles are excellent for energy and poor at removing fat, so residue accumulates on the tub, the arms and the hose over months. Fourth, A drain hose without a high loop: a hose that runs flat lets sink water and trap gas sit against the machine, which is the smell that is worse at the sink. Fifth, A door closed immediately after every cycle: a sealed damp tub is exactly the condition biofilm needs, and leaving the door ajar prevents more odour than any cleaner removes. Sixth, A neglected spray arm: the jets and the inside of the arms hold residue that seeds the smell again after the tub itself is cleaned.
What to check, in order
- take out and wash the whole filter stack, because it holds more residue than everything else combined.
- wipe the gasket channel and the tub lip by hand, since spray never reaches them.
- lift the spray arms and clear the jets, which reseeds the smell if left.
- finish with the hottest programme and a proprietary cleaner, then keep the door ajar between cycles.
- Body: Clean in order of how much residue each part holds: First, take out and wash the whole filter stack, because it holds more residue than everything else combined. Second, wipe the gasket channel and the tub lip by hand, since spray never reaches them. Third, lift the spray arms and clear the jets, which reseeds the smell if left. Fourth, finish with the hottest programme and a proprietary cleaner, then keep the door ajar between cycles.
Checks you can do yourself
- Unplug the machine, twist out the filter stack, separate the parts and wash them in hot soapy water — Tools: soft brush, dish soap — Time estimate: a few minutes
- Wipe the gasket channel, the tub lip and the door edge, working detergent into the bottom corners — Tools: cloth, old toothbrush — Time estimate: a few minutes
- Lift both spray arms off their bearings, rinse them through and clear the jets before refitting — Tools: cocktail stick — Time estimate: a few minutes
- Run the hottest programme empty with a dishwasher cleaner in the dispenser — Tools: dishwasher cleaner — Time estimate: an hour or more
- Leave the door ajar after every cycle from now on and run a hot programme regularly rather than only eco — Tools: none — Time estimate: a few minutes
- Body: This is a maintenance sequence rather than a repair: Unplug the machine, twist out the filter stack, separate the parts and wash them in hot soapy water (soft brush, dish soap; a few minutes). Wipe the gasket channel, the tub lip and the door edge, working detergent into the bottom corners (cloth, old toothbrush; a few minutes). Lift both spray arms off their bearings, rinse them through and clear the jets before refitting (cocktail stick; a few minutes). Run the hottest programme empty with a dishwasher cleaner in the dispenser (dishwasher cleaner; an hour or more). Leave the door ajar after every cycle from now on and run a hot programme regularly rather than only eco (none; a few minutes).
Safety first
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Never mix a bleach product with a descaler or any acidic cleaner in the tub; the combination releases a harmful gas in an enclosed space. Ventilate the kitchen when using a strong cleaner and let the machine cool before reaching into the sump. unplug-before-service
When to stop and call a technician
Odour is rarely a service call, but these are: The smell returns within days of a full clean and a hot cycle. Water stands in the sump between cycles, which means a drainage restriction. A sewer smell that is present at the sink with the machine idle. Any burnt or electrical smell, which means stop using the machine now. The smell returns within days of a full clean and a hot cycle Water stands in the sump between cycles, which means a drainage restriction A sewer smell that is present at the sink with the machine idle Any burnt or electrical smell, which means stop using the machine now
Nearest pages of the same kind
What this page does not cover
This page is generalized across every dishwasher sold under the Blomberg name: it separates neither the freestanding and semi-integrated stainless machines from the fully integrated panel-ready ones and the compact widths from the full-size cabinets, and it names no individual model. Where a family- or model-specific page exists it is linked here and it outranks this one for that machine; at present no page beneath this one narrows to a single family, so treat the ranking above as the brand-level pattern rather than a reading of your serial plate. For the other faults that turn up on this machine, start from Common Blomberg Dishwasher Problems.
Related pages
- Common Blomberg Dishwasher Problems
- Blomberg Dishwasher: Abnormal Noise or Vibration
- Blomberg Dishwasher: Does Not Clean or Dry
- Blomberg Dishwasher: Controls, Display or Error Code
- Blomberg Dishwasher: Cycle Will Not Run or Complete
- Blomberg Dishwasher: Door, Latch or Seal Fault
- Blomberg Dishwasher: Will Not Drain
- Blomberg Dishwasher: Electrical, Fire or Gas Hazard
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
