The short answer
Dishes coming out gritty, filmed or still wet on the Cove DW dishwasher family usually trace to three things in this order: what the arms can reach, what the filter is letting past, and what the detergent is doing in your water. Only the third of those is really about the chemistry the brand-generic page opens with.
What you see on the DW family
- Gritty deposits left on the dishes after a full cycle — Food is being redistributed rather than drained. That points at the filter and the sump before anything else.
- A white film or cloudiness on glassware — Mineral film from hard water and under-dosed detergent, or rinse aid that has run out.
- The top rack is clean and the bottom is not, or the other way round — One arm is not turning or is blocked. Which rack fails tells you which arm to pull first on these models.
- Dishes are clean but soaking wet at the end — That is drying rather than washing: rinse aid, final rinse temperature, or plastics that were never going to dry in a condensing machine.
Causes, most likely first on the DW family
- Filter and sump loaded with debris — Ranked first on the DW family — on the Cove DW dishwasher family this is the maintenance item that gets skipped, and it is the one that explains a slow decline rather than a sudden failure. A fine filter traps what the coarse one misses, and once it blinds over the pump recirculates dirty water at reduced pressure. It degrades over months, which is why owners rarely connect it to a date.
- Water temperature and fill volume at the machine — Second — and the one most affected by the house rather than the machine. A dishwasher that fills short or fills cold cannot dissolve detergent properly.
- Spray arms blocked or not rotating — Third — the arms lift out by hand and should spin with a flick. Fragments of label, seeds and bone chips block the jets, and a tall item in the rack can stop an arm outright.
- Detergent, rinse aid and water hardness — Fourth — but the one to revisit if the mechanical checks all come back clean. Under-dosing in hard water leaves film; old detergent that has absorbed moisture will not dissolve at all; an empty rinse-aid reservoir shows up as wet dishes rather than dirty ones.
- Body: The order below follows the shared parts rather than the differences — the stems in the DW family carry the same running gear and diverge at the cabinet — which is why the top of this list is not where the brand-generic article puts it.
Check in this order, and why
- 1. Pull both spray arms and spin them by hand — They should turn freely with a flick and every jet should be clear.
- 2. Run the kitchen tap hot, then start a cycle — It removes the cold-first-fill variable in one move, which is otherwise hard to separate from a detergent problem.
- 3. Lift out the filter stack and wash it — Under running water with a soft brush. If it was blinded, run one empty hot cycle before judging anything else.
- Body: The stems in the DW family share their layout, so the order below holds across the table; where a stem differs it differs at the cabinet, not at the part you are reaching for.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. The filter and the spray arms come out with the machine live and the door open, which is fine, but reach into the sump only after the cycle has been cancelled and the water has drained: broken glass in a sump is the injury this job actually produces.
Models in the DW family
Reference| Model number | Family key |
|---|---|
| DW2450 | cove:dishwasher:dw |
| DW2450WS | cove:dishwasher:dw |
| DW2451 | cove:dishwasher:dw |
| DW2451/ADA | cove:dishwasher:dw |
| DW2451/WS | cove:dishwasher:dw |
| DW2451ADA | cove:dishwasher:dw |
| DW2451ADA/WS | cove:dishwasher:dw |
When to call a technician
Call when the arms spin freely, the filter is clean, the fill is hot and full, and the dishes still come out dirty — at that point the wash pump or the diverter is not making pressure, and neither is an owner part on these models.
Other DW dishwasher pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
