The short answer for DWT models
When an Avanti DWT dishwasher leaves dishes dirty, the highest-yield checks cost nothing. Pull the filter, spin both spray arms by hand, and look at how the bottom rack was loaded.
Symptoms, and the ones that mean something else
- Detergent left undissolved in the dispenser — The dispenser did not open, or the water was too cool to dissolve it.
- Performance that has fallen off gradually over a year — The signature of accumulation rather than of a failed part.
- A white chalky film on glasses and cutlery — Water hardness and rinse aid rather than a mechanical fault.
- Only the bottom rack cleans properly — The feed to the upper arm is blocked, often by a tall item sitting in its path.
- NEAR MISS — the cycle never starts at all — A machine that will not start is a different page and a different list.
The ranking for this family
- Filter silted with food waste — Ranked first because the filter is the one part this machine asks the owner to clean and the one part almost nobody does.
- Wash pump or diverter failing — Last and least likely, and the only one on this list that needs the machine out and a technician.
- Rinse aid empty or set too low — The commonest cause of film and spotting once the wash itself is fine.
- Drain not clearing between fills — Dirty water carried into the next fill means the machine starts the rinse already soiled.
The order that saves the most time
- The order, and why it is this one — Work down this list rather than starting where the fault seems loudest.
- Look at how the bottom rack was loaded — Large flat items across the rack shadow everything behind them, which looks exactly like a pump fault.
- Look for standing water in the bottom before a cycle — Water left from last time means the machine starts dirty every run.
- Check the rinse aid reservoir — An empty reservoir explains film and spotting without anything being wrong with the wash.
Two isolations and one wait
Safety
Pull the plug or switch the breaker off, close the supply valve, and then wait for the machine to cool. A capacitor can hold a charge after the power is off, and the sump element of a dishwasher stays hot long after the cycle ends. Wear a glove when clearing the sump: glass fragments end up there and cannot be seen in water.
Models in the DWT family
Reference| Model number | Family key |
|---|---|
| DWT18V3S | avanti:dishwasher:dwt |
When to call a technician
Call once the free checks are done and the fault stands: filter cleaned, spray arms cleared, hose proved, waste proved. Call immediately rather than finishing the list if the machine has tripped a breaker, if there is water reaching a socket, or if the leak is continuous with the machine switched off, because that last one is fed at mains pressure.
Other DWT problems we cover
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
