The short answer
Odour in a countertop Blitzhome dishwasher comes from the two places water sits between cycles: the sump under the filter and the flexible drain hose lying in the sink. Because these machines run short cycles at modest temperatures and are often closed straight after use, biofilm establishes faster than in a full-size built-in. Every likely cause here is an owner fix, and none of them needs a part.
What you are seeing
- A stale or sour smell when the door is first opened
- A drain-like smell that is strongest at the sink rather than in the tub
- Grey or pink film on the filter, the sump edge or the door gasket
- Clean dishes that pick up the smell after sitting in the closed machine
- A near-miss symptom: a burnt or hot-plastic smell, which is an electrical warning and belongs on the electrical safety page
- A near-miss symptom: dishes that come out with a film, which is a wash-performance problem
- Body: Where and when you smell it narrows the cause quickly: A stale or sour smell when the door is first opened. A drain-like smell that is strongest at the sink rather than in the tub. Grey or pink film on the filter, the sump edge or the door gasket. Clean dishes that pick up the smell after sitting in the closed machine. A near-miss symptom: a burnt or hot-plastic smell, which is an electrical warning and belongs on the electrical safety page. A near-miss symptom: dishes that come out with a film, which is a wash-performance problem.
Causes, most likely first
- Biofilm on and under the sump filter — Why: the filter area is small, it traps fat and starch quickly, and the water beneath it never fully drains between cycles.
- The drain hose left lying in the sink — Why: a hose end sitting in a wet sink draws smell from the sink trap straight back into the tub, and this is the fault that smells worst at the sink.
- A closed door after every cycle — Why: compact machines hold a damp interior for hours, and closing the door immediately keeps that moisture in.
- Short cool cycles used exclusively — Why: low-temperature programmes never lift fat off the tub walls and the arm, so it accumulates cycle by cycle.
- A dirty door gasket and door edge — Why: the gasket channel holds crumbs and slime and is missed by every wash.
- Stagnant water in an unused internal tank — Why: if the machine has a fill tank and stands unused for days, the tank itself sours.
- Body: Ranked by where standing water actually sits on this design: First, Biofilm on and under the sump filter: the filter area is small, it traps fat and starch quickly, and the water beneath it never fully drains between cycles. Second, The drain hose left lying in the sink: a hose end sitting in a wet sink draws smell from the sink trap straight back into the tub, and this is the fault that smells worst at the sink. Third, A closed door after every cycle: compact machines hold a damp interior for hours, and closing the door immediately keeps that moisture in. Fourth, Short cool cycles used exclusively: low-temperature programmes never lift fat off the tub walls and the arm, so it accumulates cycle by cycle. Fifth, A dirty door gasket and door edge: the gasket channel holds crumbs and slime and is missed by every wash. Sixth, Stagnant water in an unused internal tank: if the machine has a fill tank and stands unused for days, the tank itself sours.
What to check, in order
- pull and wash the filter, and wipe the sump beneath it, because that is where the majority of the smell lives.
- take the drain hose out of the sink, rinse it through and store it dry and raised.
- wipe the door gasket and the door edge with detergent, since these are never reached by the spray.
- run the hottest available programme empty with a dishwasher cleaner, which finishes the job rather than starting it.
- Body: Clean the places that hold water, in the order they hold most: First, pull and wash the filter, and wipe the sump beneath it, because that is where the majority of the smell lives. Second, take the drain hose out of the sink, rinse it through and store it dry and raised. Third, wipe the door gasket and the door edge with detergent, since these are never reached by the spray. Fourth, run the hottest available programme empty with a dishwasher cleaner, which finishes the job rather than starting it.
Checks you can do yourself
- Unplug the machine, remove the filter and wash it in hot soapy water with a soft brush — Tools: soft brush, dish soap — Time estimate: a few minutes
- Wipe the sump, the sump edge and the underside of the filter seat with a cloth — Tools: cloth, detergent — Time estimate: a few minutes
- Lift the spray arm off its post, rinse the holes clear and refit it — Tools: none — Time estimate: a few minutes
- Wipe the whole door gasket, the door edge and the tub lip, working detergent into the gasket channel — Tools: cloth, old toothbrush — Time estimate: a few minutes
- Run the hottest empty programme with a proprietary dishwasher cleaner, then leave the door ajar to dry — Tools: dishwasher cleaner — Time estimate: an hour or more
- Body: This is a maintenance sequence, not a repair: Unplug the machine, remove the filter and wash it in hot soapy water with a soft brush (soft brush, dish soap; a few minutes). Wipe the sump, the sump edge and the underside of the filter seat with a cloth (cloth, detergent; a few minutes). Lift the spray arm off its post, rinse the holes clear and refit it (none; a few minutes). Wipe the whole door gasket, the door edge and the tub lip, working detergent into the gasket channel (cloth, old toothbrush; a few minutes). Run the hottest empty programme with a proprietary dishwasher cleaner, then leave the door ajar to dry (dishwasher cleaner; an hour or more).
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 descaling or acidic cleaner; the combination releases a harmful gas in an enclosed tub. Use a cleaner made for dishwashers, ventilate the kitchen, 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 signs are: The smell returns within days of a full clean, which suggests standing water the filter clean does not reach. Water is visible in the sump every time the machine is opened. The smell is sewer-like and also present at the sink with the machine disconnected. A burnt or electrical smell at any time, which is an immediate stop-and-call. The smell returns within days of a full clean, which suggests standing water the filter clean does not reach Water is visible in the sump every time the machine is opened The smell is sewer-like and also present at the sink with the machine disconnected A burnt or electrical smell at any time, which is an immediate stop-and-call
Nearest pages of the same kind
What this page does not cover
This page is generalized across every dishwasher sold under the Blitzhome name: it separates neither the countertop machines from the tank-fill models and the portable units that connect to a faucet, 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 Blitzhome Dishwasher Problems.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
