The short answer
Water left in a Cove dishwasher is nearly always in the path between the filtration and the disposer or air gap, not in the pump. The machine is hard-plumbed with a high loop set at installation, so the two most likely causes are a filter that has collected fine debris and a drain connection that was never fully opened.
What you are actually seeing
- Water stands in the tub floor at the end of a cycle — Means: on-page
- The machine drains partly and leaves a shallow pool — Means: on-page
- Dirty water appears in the tub after the sink has been used — Means: on-page
- A gurgle from the sink whenever the machine drains — Means: on-page
- The machine has never drained fully since it was installed — Means: on-page
- The cycle stops early with a full tub — Means: different-fault — Go to: cove-dishwasher-cycle-fault
- Water on the floor rather than in the tub — Means: different-fault — Go to: cove-dishwasher-water-leak
- Body: Match what you see before you take anything apart. Water stands in the tub floor at the end of a cycle. The machine drains partly and leaves a shallow pool. Dirty water appears in the tub after the sink has been used. A gurgle from the sink whenever the machine drains. The machine has never drained fully since it was installed. Some near-miss symptoms belong on a different page: The cycle stops early with a full tub points at a cycle fault, covered on cove-dishwasher-cycle-fault; Water on the floor rather than in the tub points at a leak, covered on cove-dishwasher-water-leak.
Causes, ranked for this machine
- Fine debris collected in the multi-stage filtration — Why this rank: First because premium filtration catches finer material than a coarse filter does, which means it collects more and needs a regular hand clean rather than an occasional one
- A disposer knockout plug never removed at installation — Why this rank: Classic fitting fault: the machine has never drained properly since the day it went in, and the symptom dates from installation rather than from a failure
- A blocked air gap on the worktop, where one is fitted — Why this rank: Invisible until the cap comes off, and it produces exactly this symptom
- A drain hose whose high loop has been disturbed by later cabinetry work — Why this rank: The loop was set by the fitter, and kitchen work afterwards is what disturbs it
- A blocked or failed drain pump — Why this rank: Last because everything above it is free and because a genuinely failed pump is far rarer than a blocked path
- Body: Ranked for a premium built-in dishwasher: hard-plumbed, on a dedicated supply, installed under a worktop by a fitter, quiet by design, with hand-cleaned filtration and a condensation dry that depends on rinse aid. Most likely: Fine debris collected in the multi-stage filtration. First because premium filtration catches finer material than a coarse filter does, which means it collects more and needs a regular hand clean rather than an occasional one. Next most likely: A disposer knockout plug never removed at installation. Classic fitting fault: the machine has never drained properly since the day it went in, and the symptom dates from installation rather than from a failure. Third: A blocked air gap on the worktop, where one is fitted. Invisible until the cap comes off, and it produces exactly this symptom. Fourth: A drain hose whose high loop has been disturbed by later cabinetry work. The loop was set by the fitter, and kitchen work afterwards is what disturbs it. Fifth: A blocked or failed drain pump. Last because everything above it is free and because a genuinely failed pump is far rarer than a blocked path.
What to check, in order
- Remove and clean the whole filter assembly, not just the coarse screen
- Establish whether the machine has ever drained properly since installation
- Lift the air gap cover on the worktop and clear it
- Check the drain hose still loops high in the cabinet
- Body: Each check rules out the causes above it. First, remove and clean the whole filter assembly, not just the coarse screen. Second, establish whether the machine has ever drained properly since installation. Third, lift the air gap cover on the worktop and clear it. Fourth, check the drain hose still loops high in the cabinet.
Checks you can safely make yourself
- Switch off at the breaker, bail the standing water out, then remove the full filter assembly and rinse every stage under a hot tap — Tools: cup, sponge, brush, gloves — Time estimate: half an hour
- Look into the sump beneath the filtration with a torch and remove any glass, seeds or bone fragments by hand — Tools: torch, gloves — Time estimate: a quarter of an hour
- If the drain goes to a disposer, establish whether the machine has ever drained fully since it was installed — Tools: none — Time estimate: a few minutes
- Lift the cap and cover off the air gap on the worktop and clear any debris from the chamber — Tools: none — Time estimate: a quarter of an hour
- Open the adjacent cabinet and check the drain hose still rises above the machine before it drops, securing it if it has sagged — Tools: torch, cable tie — Time estimate: a quarter of an hour
- Body: Checks an owner can make with the machine switched off at the breaker, or by watching a cycle. Step one: Switch off at the breaker, bail the standing water out, then remove the full filter assembly and rinse every stage under a hot tap. Tools: cup, sponge, brush, gloves. Time: half an hour. Step two: Look into the sump beneath the filtration with a torch and remove any glass, seeds or bone fragments by hand. Tools: torch, gloves. Time: a quarter of an hour. Step three: If the drain goes to a disposer, establish whether the machine has ever drained fully since it was installed. Tools: none. Time: a few minutes. Step four: Lift the cap and cover off the air gap on the worktop and clear any debris from the chamber. Tools: none. Time: a quarter of an hour. Step five: Open the adjacent cabinet and check the drain hose still rises above the machine before it drops, securing it if it has sagged. Tools: torch, cable tie. Time: a quarter of an hour.
Safety first
Safety
Switch off at the breaker before bailing the tub or reaching into the sump, and wear gloves: broken glass in the sump is the most common injury on this job. Never run a disposer with a hand near it. Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. unplug-before-service
Where the owner fix ends
Call a technician when the whole filter assembly is clean, the disposer connection is proven open, the air gap is clear and the drain hose loops high, and the tub still holds water. On an integrated machine, reaching the drain pump means removing the custom panel and drawing the machine out of a fitted opening.
Nearest pages of the same kind
Generalized information
This page is generalized across the Cove dishwasher line. Fully integrated machines carrying a custom cabinet panel and machines with a finished front share the ranking above but not every part, and this page does not cover a specific model, control revision or installation. Family- and model-specific pages, where they exist, are linked below.
Links: - [Common COVE Dishwasher Problems](/blog/cove-dishwasher-problems) - [COVE Dishwasher: Abnormal Noise or Vibration](/blog/cove-dishwasher-abnormal-noise) - [COVE Dishwasher: Does Not Clean or Dry](/blog/cove-dishwasher-cleaning-performance) - [COVE Dishwasher: Controls, Display or Error Code](/blog/cove-dishwasher-control-fault)
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
