The short answer
A Cosmo DG Dishwasher that has quietly got worse over months is describing a filter and spray-arm problem, not a failed pump. Sudden total failure is a different page. On this model the arms and the filter come out by hand, which is why they lead the order here rather than sitting halfway down a generic list.
What you see on the DG 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 this model.
- 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 DG family
- Water temperature and fill volume at the machine — Ranked first on the DG family — where the machine sits far from the water heater this dominates everything else, and it costs nothing to test. A dishwasher that fills short or fills cold cannot dissolve detergent properly. Running the kitchen tap hot before starting a cycle is the standard way to stop the first fill arriving cold.
- Spray arms blocked or not rotating — Second — 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.
- Filter and sump loaded with debris — Third — a blinded filter starves the arms, so it produces the same symptom from one step further back. A fine filter traps what the coarse one misses, and once it blinds over the pump recirculates dirty water at reduced pressure.
- 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 is this family's rather than the brand's: with one build in the DG family the ranking is not an average diluted by chassis that fail differently, so the cause at the top is the cause that actually leads on DG1-A6301-AM.
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. Reload the racks and run it again — Nesting and oversized items shadow whole zones. Changing nothing but the loading is a legitimate test and it is free.
- 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: Because the DG family is one model, the access route below is the access route — there is no second layout to hedge against, which is exactly what the page above this one has to do.
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 DG family
Reference| Model number | Family key |
|---|---|
| DG1-A6301-AM | cosmo:dishwasher:dg |
When to call a technician
On the Cosmo DG dishwasher family the owner line is everything reachable through the open door. Once the diagnosis moves behind the lower access panel — pump, diverter, heater or the wiring to them — it needs the machine isolated and pulled, and that is the point to hand it over.
Other DG 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.
