The short answer
On a DCS by Fisher & Paykel dishwasher, why water is standing in the bottom comes down to a short list, and on this line the order is not the generic one. The diagnosis starts at the motorised lid seal and the flexible harness that moves with the drawer, because the drawer platform seals across a whole perimeter with a powered lid and carries its water and drain lines on a harness that flexes every time the drawer opens, which is nothing like a hinged-door machine. The first three checks below need no tools and no parts; the point at which this stops being an owner job is stated further down, as a condition rather than as a recommendation.
What you are seeing
- Standing water in the sump at the end of every cycle.
- Dirty water that will not clear even after a drain-only cycle.
- Water backing up into the machine from the sink.
- A drain pump audible for the whole drain phase but nothing leaving the machine.
- The cycle ending early with water still in the tub.
- A gurgle at the sink whenever the machine drains.
- Note: Near-miss symptoms that mean a different fault: A small amount of clean water in the sump between cycles is normal and keeps the seals wet. If water is on the floor rather than in the tub, that is the leak page. If the machine will not start the drain at all and nothing runs, read the will-not-start page.
Causes, ranked for a DCS by Fisher & Paykel dishwasher
- The motorised lid seal and the flexible harness that moves with the drawer — Why this rank: The drawer platform seals across a whole perimeter with a powered lid and carries its water and drain lines on a harness that flexes every time the drawer opens, which is nothing like a hinged-door machine.
- A kinked, crushed or badly routed drain hose — Why this rank: The hose is routed by whoever installed the machine, and it is the part most often pinched behind a cabinet.
- A blocked air gap or a missing high loop — Why this rank: Without a high loop or an air gap the sink drains into the dishwasher, which reads as a drainage failure from inside.
- A garbage disposal knock-out plug never removed — Why this rank: It is a factory plug that must be punched out at install, and a machine plumbed into a disposal without it will never drain once.
- A blocked household drain downstream of the machine — Why this rank: The machine is only as good as the pipe it empties into, and a sink that gurgles is telling you where the problem is.
- A blocked filter, sump screen or drain trap — Why this rank: It is the first restriction in the drain path and the only one that fills up with normal use.
What to check, in order
- Bail the standing water out, remove the filter and the sump screen, and look at what comes out with them. — Order: First — Why: It is the top cause, it needs no tools, and it must be cleared before anything else can be judged.
- Follow the drain hose from the machine to where it terminates and look for kinks, crushing and the high loop. — Order: Second — Why: It is the second cause and it is entirely visible under the sink.
- Run the sink and the disposal, and check whether the sink itself drains freely. — Order: Third — Why: It separates a household plumbing problem from a machine problem in a minute.
- Start a drain-only cycle and listen at the base of the machine. — Order: Fourth — Why: A humming pump that moves nothing is jammed; a silent pump is not being commanded or has failed, and the sound tells you which.
Steps a homeowner can take
- Switch the machine off at its breaker before reaching into the sump or removing a panel. — Tools: none — Time: a moment
- Bail the standing water into a bowl and sponge the sump dry. — Tools: cup, sponge, bowl — Time: several minutes
- Remove the filter and the sump screen, wash them under a hot tap, and clear anything visible in the sump housing with a gloved hand. — Tools: gloves, brush — Time: half an hour or so
- Trace the drain hose under the sink, straighten any kink, and secure it in a high loop above the machine. — Tools: flashlight, cable tie — Time: half an hour or so
- If the machine drains into a disposal, remove and inspect the disposal inlet and confirm the knock-out plug was punched out. — Tools: screwdriver, bucket — Time: half an hour or so
- Clear the air gap on the sink deck by lifting its cover and flushing it. — Tools: none — Time: several minutes
Before you start
Safety
Switch the machine off at its breaker before reaching into the sump or removing a panel. A capacitor can hold a charge after the power is off. Never put a hand into a garbage disposal, even with the power off. Sump water contains glass fragments — use gloves. Water on the floor next to a powered appliance is a shock hazard.
When this stops being an owner job
Call when the filter and sump are clean, the hose is straight and looped high, the sink drains freely, the disposal plug is out, and the machine still holds water. What remains is the pump and the check valve, and both are behind the base panel.
Sources
General guidance- The control of hazardous energy (lockout/tagout), and manufacturer service-manual practice — OSHA 1910.147 / manufacturer service manuals, fetched 2026-09-06
Nearest pages
Generalized information
This page is generalized: it covers DCS by Fisher & Paykel across a whole dishwasher range rather than one family or one model, and where a more specific page exists it is linked here. It does not cover model-level pages for individual DCS by Fisher & Paykel units, and it does not carry serial-range or model-group detail — check the rating plate before ordering any part. DCS Dishwasher: Will Not Drain — Slug: dcs-dishwasher-drainage-failure — Covers: the wider DCS badge this line sits under
Where to go next
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
