The short answer
On the Cafe CDD family standing water at the end of a cycle is more often outside the machine than inside it: a new disposer with its knockout plug still in place, a blocked air gap, or a drain hose that has lost its high loop. One model tag covers this family in the matrix below, which keeps parts ordering simple and leaves the whole of the diagnosis to the symptom. Those three account for most of the calls, and none of them needs the machine opened.
What you can observe on these models
- A hum at the drain step with no water movement — The pump is being driven but cannot turn, which is the signature of a jammed impeller or a solid blockage.
- Silence at the drain step — No pump drive at all — a control, a wiring or a pump motor fault rather than an obstruction.
- The sink gurgles while the dishwasher drains — The shared line is restricted, so the machine is pushing against a partly blocked disposer or trap.
- Water backs up out of the air gap on the sink deck — The line between the air gap and the disposer is blocked, which is a plumbing fix rather than an appliance one.
- NEAR MISS — a little water in the sump well every time — A small residual in the well is by design; it keeps the seals wet. Only a covered tub floor counts as a drainage failure.
Causes, most likely first on this family
- Drain hose loop lost or crushed behind the cabinet — Ranked first here because the fault arrived with the move, and a crushed hose blocks completely.
- Sink-side blockage — disposer, trap or air gap — Second: run the disposer and fill the sink to prove the household drain is clear before blaming the appliance.
- Filter and sump soil load — Third — clearing it also prevents the next blockage, which none of the other fixes do.
- Impeller jam at the drain pump — Fourth: the hum is what earns it a place, and the object is usually the piece of glass that went missing weeks ago.
- Pump motor or check valve failure — Last, and a service call.
Check in this order, and why
- Confirm the cycle actually reached the drain step — A cycle that aborted early leaves water behind without any drainage fault existing at all.
- Inspect the disposer connection for the knockout plug — On a recent installation this is the first thing to check and the fault is total until it is removed.
- Clear the filter and inspect for glass — Use a gloved hand. Glass in the sump is both the cause and the reason to be careful about how you clear it.
- Straighten and re-loop the drain hose — Give it the rise it needs behind the cabinet so the tub cannot siphon back after a good drain.
Before you open anything
Safety
Power down at the breaker before the sump cover comes off; a capacitor can hold a charge after the power is off. Dirty standing water is a hygiene hazard as much as an electrical one — scoop it into a bucket rather than bailing it onto the floor, and wash hands and tools afterwards. The heating element in the tub floor may still be hot.
Models in the CDD family
Reference| Model number | Family key |
|---|---|
| CDD220**W*** | cafe:dishwasher:cdd |
When to call a technician
On the Cafe CDD family everything up to and including the pump inlet is owner-reachable: the disposer, the air gap, the hose, the filter and the sump. Call when the drain step is silent, when the pump hums with a clear inlet, or when the fault returns within days of a full clean — those point at the pump, the check valve or the control. Call a plumber instead if the sink itself drains slowly.
Other faults covered for this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
