The short answer
A Grandeur dishwasher sitting in dirty water is usually blocked rather than broken, and the blockage is most often in the filter or in the waste connection under the sink. On this machine it is a house label, so the cabinet is one of a handful of factory platforms wearing a name rather than a design of its own, which is why the order below starts where it does. Bail it out before you do anything else, because you cannot work in standing water.
What you observe
- Water standing in the base at the end of a cycle — Some water in the sump well is normal; water covering the filter is not.
- You hear the pump run but the level does not drop — A blockage downstream: hose, air gap or the waste connection.
- It drains slowly and leaves a smell — A partial restriction, which is the same fault earlier in its life.
- NEAR MISS: water on the kitchen floor — That is a leak rather than a drain fault, and the leak page is the one you want.
Causes, most likely first on this build
- Filter, sump or drain hose blocked with debris — Ranked first on this build: the fine filter on this platform silts quickly, and debris that gets past it lodges in the sump where the pump cannot shift it.
- Waste connection blocked, or the disposer plug never removed — Second: the machine shares its waste with the sink, so a blocked trap backs straight up into the base.
- Drain hose kinked, or its high loop missing — Third: without a high loop, waste water siphons back into the base and looks exactly like a drain failure.
- Drain pump or its control output failed — Last: last, and it needs a meter rather than a sponge.
Check in this order, and why
- Listen at drain time: does the pump run at all? — A running pump means a downstream blockage; silence means the pump or its control.
- Bail out the standing water and lift the filter and sump cover — This is both the diagnosis and the fix in most cases.
- Check under the sink for the waste connection and the disposer plug — A knock-out plug left in a new disposer blocks the machine completely.
What an owner can safely check
- Bail the standing water out with a jug and a sponge — You cannot work on a flooded base, and it takes only a few minutes.
Tools: jug, sponge, towelsAbout 15 min
- Check the waste connection under the sink, including any disposer knock-out plug — This is the fault that makes a perfectly good machine look dead.
Tools: torch, bucketAbout 25 min
- Pull the machine out, straighten the drain hose and secure its high loop — The loop stops waste siphoning back and it is often missing after a rushed fit.
Tools: torch, cable tieAbout 25 min
- STOP HERE if the next step needs the pump out or a meter on live terminals — That is where an owner check ends and a service call begins.
Before you open anything
Safety
Switch off at the breaker before removing any panel or reaching into the sump, because the machine sits in a wet cupboard. Wear gloves when clearing the sump: broken glass is the usual find and you will be feeling rather than looking. Water standing in the base may still be hot after a cycle, so let it cool before bailing it out.
When to call a technician
Call once the filter and sump are clear, the waste connection runs, the hose is straight and its loop is secure and it still holds water, because the next step is the pump. Call a plumber rather than an appliance technician if the sink waste itself backs up, since the fault is then in the house. Parts are ordered against the model plate rather than the badge, and on a compact build the cost of a major part sits close enough to the cost of the machine that the quote decides the repair.
Nearest pages of this class
What this page does not cover
This page covers the Grandeur dishwasher as a class rather than one family or model line. Pump part numbers, filter and sump variants, hose fittings and the waste arrangements used on individual installations are deliberately not here. Where a family or model page exists for your unit, it is the more specific answer and the one to read first; the nearest pages of this class are linked just above.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
