The short answer for AVDWEH models
On the AVDWEH line a drainage fault has a clear order to it. Clear the filter and the sump first because they are free, then the hose and the household connection, and only then treat the pump as a suspect.
Symptoms, and the ones that mean something else
- A cycle that stops partway and shows a fault — Many machines abort when they cannot verify the water has gone.
- The problem appeared right after a new waste disposer was fitted — The knockout plug, almost every time.
- A humming at the drain step with nothing moving — The pump is being asked to run against a blockage.
- Water backing up into the sink when the machine drains — The household connection, not the machine.
- NEAR MISS — the machine will not start at all — A machine that never runs has a different diagnosis entirely.
Causes on AVDWEH, most likely first
- Filter and sump packed with food waste — Ranked first because it is the commonest and the only one the owner is asked to maintain.
- Sink waste trap blocked — The machine drains into it, so a blocked trap stops the machine as surely as a blocked hose.
- No high loop in the drain hose — Without the loop, sink water siphons back into the machine, which reads as a drain that never worked.
- Waste disposer knockout plug still in place — Second and the reason a machine that drained yesterday does not today: fitting a disposer without removing the plug seals the drain completely.
Check in this order, and why
- Start with what the ranking makes most likely — This order exists because the cheap causes are also the likely ones: four of the four named above can be settled on AVDWEH models before a tool comes out.
- Fill the sink and let it drain — A sink that drains slowly means the household waste is the problem, not the machine.
- Check the air gap on the worktop if the installation has one — Grease builds inside it and it is the one part of the path visible from above.
- Look into the sump with a torch for debris and foreign objects — Glass and fruit stones reach the impeller once the filter stops catching them.
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 AVDWEH family
Reference| Model number | Family key |
|---|---|
| AVDWEH18W3S | avanti:dishwasher:avdweh |
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 AVDWEH 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.
