The short answer
A Cosmo dishwasher is a built-in kitchen machine with an electronic control, a manual filter and a drain that runs to a disposer or an air gap. That combination decides what goes wrong: the filter, the drain path, the hot water supply and the supply under the sink account for most calls, while genuine component failures are the minority.
What you are actually seeing
- The machine will not start, usually the supply under the sink or the door latch — see cosmo-dishwasher-wont-start — Means: on-page
- Water standing in the tub, almost always the filter or the disposer connection — see cosmo-dishwasher-drainage-failure — Means: on-page
- Dirty or wet dishes, usually filter, spray arms, loading or rinse aid — see cosmo-dishwasher-cleaning-performance — Means: on-page
- A cool wash, which normally starts at the house hot supply — see cosmo-dishwasher-heating-failure — Means: on-page
- Water on the floor, most often the door gasket, detergent foam or a connection under the sink — see cosmo-dishwasher-water-leak — Means: on-page
- A burning smell or a repeated trip, the one problem to stop using the machine over — see cosmo-dishwasher-electrical-safety — Means: on-page
- A cycle that starts and then stalls — Means: different-fault — Go to: cosmo-dishwasher-cycle-fault
- A sour smell with clean dishes — Means: different-fault — Go to: cosmo-dishwasher-smell-mold
- Body: Each problem below names what you see and links to the page that covers it. The machine will not start, usually the supply under the sink or the door latch — see cosmo-dishwasher-wont-start. Water standing in the tub, almost always the filter or the disposer connection — see cosmo-dishwasher-drainage-failure. Dirty or wet dishes, usually filter, spray arms, loading or rinse aid — see cosmo-dishwasher-cleaning-performance. A cool wash, which normally starts at the house hot supply — see cosmo-dishwasher-heating-failure. Water on the floor, most often the door gasket, detergent foam or a connection under the sink — see cosmo-dishwasher-water-leak. A burning smell or a repeated trip, the one problem to stop using the machine over — see cosmo-dishwasher-electrical-safety. Some near-miss symptoms belong on a different page: A cycle that starts and then stalls points at a supply the machine is waiting for rather than a failed board, covered on cosmo-dishwasher-cycle-fault; A sour smell with clean dishes points at biofilm in the filter and gasket, covered on cosmo-dishwasher-smell-mold.
Causes, ranked for this machine
- Filter and drain-path faults, including the disposer knockout plug and the air gap — Why this rank: First because this machine has a manual filter and nothing to grind waste, so the drain path collects everything that leaves the plates
- Hot water supply faults: a cold first fill, a closed valve, a cool house supply — Why this rank: Second because washing, drying and cycle length all depend on temperature, so one supply problem degrades everything at once
- Supply and interlock faults under the sink — Why this rank: Third because the outlet or junction box under a kitchen sink is the most disturbed and wettest connection in the house
- Loading and detergent faults — Why this rank: Fourth because they cause poor cleaning, foam leaks and odour together, and owners rarely suspect them
- Door gasket and spring faults — Why this rank: Fifth because they produce leaks and start failures from a machine that is otherwise sound
- Component failures: pump, element, latch switch, control board — Why this rank: Last because the five categories above account for most calls
- Body: Ordered by how often each class of problem is the real reason an owner calls about a machine of this type. No denominator is available for this brand and appliance, so these are ordered by class rather than by a measured share. Most likely: Filter and drain-path faults, including the disposer knockout plug and the air gap. First because this machine has a manual filter and nothing to grind waste, so the drain path collects everything that leaves the plates. Next most likely: Hot water supply faults: a cold first fill, a closed valve, a cool house supply. Second because washing, drying and cycle length all depend on temperature, so one supply problem degrades everything at once. Third: Supply and interlock faults under the sink. Third because the outlet or junction box under a kitchen sink is the most disturbed and wettest connection in the house. Fourth: Loading and detergent faults. Fourth because they cause poor cleaning, foam leaks and odour together, and owners rarely suspect them. Fifth: Door gasket and spring faults. Fifth because they produce leaks and start failures from a machine that is otherwise sound. Sixth: Component failures: pump, element, latch switch, control board. Last because the five categories above account for most calls.
Where the owner fix ends
Cleaning the filter, clearing the drain path, running the hot tap first, correcting the load and the detergent, and checking the door and the supply are all owner work, and they resolve most complaints. Stop and call a technician for any burning smell, any repeated breaker trip, any tingle, and for anything that survives every check above.
Nearest pages of the same kind
Generalized information
This page is generalized across the Cosmo dishwasher line. Front-control and top-control machines, and panel-ready and stainless fronts, share the ranking above but not every part, and it does not cover a specific model or control revision. Family- and model-specific pages, where they exist, are linked below.
Links: - [COSMO Dishwasher: Abnormal Noise or Vibration](/blog/cosmo-dishwasher-abnormal-noise) - [COSMO Dishwasher: Does Not Clean or Dry](/blog/cosmo-dishwasher-cleaning-performance) - [COSMO Dishwasher: Controls, Display or Error Code](/blog/cosmo-dishwasher-control-fault) - [COSMO Dishwasher: Cycle Will Not Run or Complete](/blog/cosmo-dishwasher-cycle-fault)
Related pages
- COSMO Dishwasher: Abnormal Noise or Vibration
- COSMO Dishwasher: Does Not Clean or Dry
- COSMO Dishwasher: Controls, Display or Error Code
- COSMO Dishwasher: Cycle Will Not Run or Complete
- COSMO Dishwasher: Door, Latch or Seal Fault
- COSMO Dishwasher: Will Not Drain
- COSMO Dishwasher: Electrical, Fire or Gas Hazard
- COSMO Dishwasher: Not Heating
- COSMO Dishwasher: Odor or Mold
- COSMO Dishwasher: Water Leak
- COSMO Dishwasher: Will Not Start or No Power
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
