AVANTI Dishwasher: Will Not Drain
A dishwasher that will not drain has an obstruction far more often than a failed pump, and on a machine installed under a sink the obstruction is as likely to be in the household plumbing as in the appliance. The ordering below is what makes this page worth reading on an Avanti dishwasher. This is a compact cabinet with very little air around its condenser, so clearance and ventilation outrank component failure. What ranks first here is something you can correct yourself in under an hour, which is the reason to work down the list in order rather than book a visit straight away.
What you are actually seeing
- Check your symptom against this list first.
- Standing water in the bottom of the tub at the end of the cycle.
- A drain or pump code, or a cycle that stops before the final rinse.
- The machine drains slowly and leaves a film on everything.
- Water backing up into the sink when the dishwasher pumps.
- Not this fault: If a small amount of clean water sits in the sump between cycles, that is normal on many machines.
Causes, in the order worth checking
- Ranked by how often each turns out to be the answer on an Avanti dishwasher.
- Air gap or high loop missing or blocked — Why: The drain hose must rise above the flood level of the sink, either through an air gap on the worktop or a high loop under it. Without it the machine siphons; with a blocked air gap it cannot drain at all. Compact units are put wherever they fit — alcoves, closets, garages — so installation faults are over-represented in this class.
- Blocked filter and sump — Why: The filter assembly in the base of the tub catches everything that comes off the dishes, and on many machines it is a manual-clean part that owners never learn about.
- Waste disposal not cleared, or the knockout plug never removed — Why: Where the drain hose connects to a disposal, the disposal has to be run and clear. On a new installation the disposal’s knockout plug is often left in, which blocks the drain completely from day one.
- Glass, label or bone fragment in the pump — Why: Small hard debris that gets past the filter jams the impeller. The pump then buzzes without moving water, which sounds different from a pump that is not running.
What to check, and in what order
- Each step eliminates the largest branch of the tree for the least effort.
- Lift out the filter assembly and look at what is under it. — Why: It is the most common cause, it is designed to be owner-serviceable, and it takes five minutes.
- Run the waste disposal, then start a drain cycle. — Why: It clears the most common shared-plumbing cause without touching the appliance.
- Check the air gap on the worktop, or that the hose has a high loop under the sink. — Why: It catches both the siphon fault and the no-drain fault, and it is an installation defect rather than a repair.
Checks you can safely do yourself
- Stop at the first step that would put a meter on live terminals.
- Switch the machine off at the breaker and scoop the standing water out of the tub with a cup and a sponge. — Tools: Cup, sponge, towels
About 15 min
- Twist out the filter assembly, wash it under a running tap with a soft brush, and clear the sump beneath it. — Tools: Soft brush, gloves
About 20 min
- Run the waste disposal for thirty seconds with cold water, then run a rinse cycle on the dishwasher. — Tools: None
About 20 min
- Lift the cap off the air gap on the worktop and clear any debris inside it. — Tools: Torch, cloth
About 15 min
Before you touch 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. — Id: unplug-before-service
Switch off the dishwasher at its breaker before reaching into the sump or removing any panel; many machines are hard-wired with no plug to pull. The water in the tub can be hot after a cycle and can contain glass fragments — wear gloves and use a sponge rather than your fingers. A capacitor in the control can hold a charge after the power is off.
Where the owner checks end
Call a technician when one of these is true, and not before.
When the filter, air gap, disposal and hose are all clear and the pump is silent at the drain phase. When the impeller is damaged or jammed with glass. When water backs up into the sink, which is a plumbing job rather than an appliance one.
Sources
General guidance- 29 CFR 1910.147 — The Control of Hazardous Energy — US Occupational Safety and Health Administration, fetched 2026-09-06
Nearest pages of the same kind
What this page does not cover
Links down: - [Common AVANTI Dishwasher Problems](/blog/avanti-dishwasher-problems)
This page is generalized: it covers the Avanti dishwasher line as a whole and does not narrow to a family, a model number or a serial range. The use-and-care guide covers the owner-serviceable envelope; a full service manual is not generally published for these models, so diagnosis works from the symptom rather than from a published code chart. The overview at avanti-dishwasher-problems lists every problem class for this machine and routes down to the page for each; any family- or model-specific page that exists beneath this one is linked from there.
Other faults on this machine
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
