Direct answer
An appliance problem limited to one cycle, load, zone or operating condition should be separated from a component that fails every time. For dishwasher drain system, first run Cancel/Drain and inspect accessible filter, air gap and hose installation.
What this covers
- dishwasher drain system with this exact failure state
- Diagnosis across filter/pump cover/hose/air gap versus disposal plug and household drain
- Customer-accessible observation, settings and external components
What it does not cover
- ×A displayed manufacturer error code with a different documented meaning
- ×Live electrical, sealed-system, internal battery-cell or gas repair
- ×A claim that every model exposes identical controls
Capture the exact failure state
ReversibleName the failing cycle, load, zone or operating condition and one safe condition that still works. Expected behavior: empty used water without sink/disposal backflow.
Isolate the component boundary
ReversibleRun Cancel/Drain and inspect accessible filter, air gap and hose installation. Change only the cycle, load, temperature, zone or installation condition while keeping the appliance setup unchanged. Boundary to separate: filter/pump cover/hose/air gap versus disposal plug and household drain.
Correct only the proven cause
ReversibleClear/reassemble the approved path or correct plumbing/disposal connection. Correct the isolated selection, loading, installation or operating condition.
Verify and stop safely
ReversibleRepeat the safe controlled cycle and compare the known-working condition. Stop for wastewater backup, glass, electrical wetting or under-unit leaks.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check first when dishwasher drain system has this problem?+
Run Cancel/Drain and inspect accessible filter, air gap and hose installation.
Why not factory-reset immediately?+
The useful boundary is filter/pump cover/hose/air gap versus disposal plug and household drain. A reset can erase state without proving which side failed.
When should I stop troubleshooting?+
stop for wastewater backup, glass, electrical wetting or under-unit leaks.
Answer for the exact device and software version shown above.