Samsung Dishwasher Not Draining: Causes, Checks and Repair Costs

A Samsung dishwasher that will not drain has 6 usual causes, and the first one to rule out takes 2 minutes and no tools — the filter in the bottom of the tub. Below that sits a sump and a drain pump, and above them a hose that has to rise before it falls. Get the order of checks right and most of these never need a technician. Across 2,160 completed dishwasher repairs our median invoice is $330, parts and labour included.

Match What Your Dishwasher Is Doing

How much water is left and whether you hear the drain pump at all separates the free fixes from the paid ones. Check both before ordering anything.

Two Pumps, and Only One of Them Drains

A Samsung dishwasher has two pumps and confusing them is the most expensive mistake in this repair. The circulation pump drives water up the arms to spray the dishes. The drain pump pushes waste water out to the sink waste. They are separate parts at separate prices, and they fail with different symptoms.

A failed circulation pump leaves dishes dirty but the machine still empties. A failed drain pump leaves the tub full but the dishes may look reasonably clean, because the wash phase worked fine. Any diagnosis that does not say which pump it means is guessing — a circulation pump typically totals $381 against $335 for a drain pump, and neither fixes what the other does.

The debris story matters because a dishwasher, unlike a washing machine, is fed by hand. Everything scraped off a plate that gets past the filter ends up in the sump. Broken glass is the worst: a shard wedged beside the impeller jams it in a way that sounds exactly like a burnt-out motor, and it is invisible until the pump comes out.

Drain Codes and What They Actually Tell You

Samsung uses a drain-error message when the water level has not dropped enough within the time the cycle allows. On most models that appears as a code beginning with 5, and older units may show a similar two-character message. It is worth being precise about what it means: the water did not leave. It does not say why.

The machine cannot distinguish between a filter packed with debris, a jammed pump, a hose kinked behind the cabinet, a blocked disposal and a house drain that cannot take the flow. So the code is a starting point, not a diagnosis, and it never justifies ordering a part on its own. What it does prove is useful: the control reached the drain step and asked for the pump, which rules out several door-switch and cycle faults straight away.

An overfill message is the opposite case and worth knowing about. If the machine reports too much water rather than a failed drain, the inlet valve may be passing when it should be closed, and the tub is filling faster than the pump can empty it. That is a valve fault, typically $330 all in, and treating it as a drain fault leads nowhere.

What You Can Check in Twenty Minutes

If the filter is clean, the sump is clear, the disposal runs, the hose has a proper high loop and the tub is still full, the fault is in the drain pump or the control. That needs a meter, and this is where guessing gets expensive — two pumps and a board are three prices for one symptom.

What a Technician Actually Checks

The order matters, because each test rules out a branch of causes instead of replacing parts and hoping.

What Samsung Dishwasher Drain Repair Costs

These are complete invoices from our own jobs — part, labour and the visit together, not a parts price with extras added later. Ranges show the middle half of jobs, and the count is how many repairs each figure is based on.

Clearing the filter and sump during the visit is not a separate job. What raises the bill is a pump fitted while the glass that jammed the old one is still in the sump, or a drain pump replaced when the actual fault was a hose with no high loop.

The High Loop, the Air Gap and Why Installation Matters Here

More Samsung drain complaints trace back to plumbing than to the appliance. The drain hose must rise to just under the worktop before dropping to its connection, or it needs an air gap fitted on the worktop itself. Either arrangement does the same job: it breaks the siphon so that waste water from the sink cannot flow back into the dishwasher tub.

When that loop is missing, two things happen. Dirty water appears in the bottom of the dishwasher between cycles, which looks exactly like a machine that will not drain, and the pump has to work against a column of water that never fully clears. Owners describe finding the tub full of water they did not put there, and no part inside the machine is responsible.

The knockout plug is the other installation fault, and it is absolute rather than partial. A garbage disposal arrives with the dishwasher inlet sealed by a moulded plastic plug that has to be knocked out before the hose is connected. Miss that step and the dishwasher cannot drain a single drop from the day it is installed. If your machine has never once drained properly since it was fitted, check this before anything else — it is a two-minute job and it is not rare.

Repair or Replace

Dishwashers are cheap to repair relative to their replacement cost, and drain faults sit at the cheap end of that. Replacement only makes sense when the tub or the wiring is compromised.

Why the Same Fault Comes Back

Repeat drain visits on dishwashers trace to one of two things: debris that was never removed, or a hose route that was never corrected. A drain pump replaced with glass still in the sump is a repair on a timer. So is a pump fitted to a machine whose hose runs flat under the sink, because the new pump faces the same back-pressure that wore out the last one.

The second pattern is the filter, and it is the most preventable fault in this entire article. A Samsung filter that has never been removed collects a layer of grease and paper that restricts flow long before it blocks it. Drain times stretch, the wash gets worse because the circulation pump is drawing through the same restriction, and eventually a cycle times out. Nothing is broken, and the fix is five minutes at a sink. Once a month is the right interval, and every couple of weeks if you rinse very little off the plates.

The third is the sink side. A dishwasher that shares a waste with a disposal depends on that disposal being empty and the trap being clear. Households that use the disposal heavily see the dishwasher back up first, because it is the appliance with the weakest pump on that shared pipe. Running the disposal before starting a wash is a habit worth having, and it prevents more call-outs than any part on the price list.

How Much Water Is Normal

Some water in the well at the end of a cycle is by design. The sump on many Samsung models is meant to stay wet so the seals do not dry out, so a small amount — a cup or so, clean rather than dirty — is normal and not a fault to chase.

What is not normal is dirty water, water deep enough to reach the filter housing, or water that appears between cycles when the machine has not run. Those three point at a blockage, a drain fault or a siphoning hose respectively. A healthy Samsung drains its tub in roughly one minute at the end of a cycle, and you can hear the pump note change as the water clears.

After any repair or cleaning, run one empty hot cycle before loading dishes. It flushes what was loosened, confirms the drain time, and reveals a hose that was not reseated while the floor is still dry. Two habits prevent most of what is described here: clean the filter monthly, and scrape plates rather than relying on the machine to deal with solids. Nothing in a dishwasher is designed to pump food.

What To Do Right Now

Cancel the cycle, bail the water out, then twist out the filter and wash it under a tap. Look into the sump underneath with a torch and lift out any glass or stones with pliers. Run the garbage disposal if you have one, and check under the sink that the drain hose rises to the worktop before it falls. If the filter is clean, the sump is clear, the disposal runs and the tub is still full, the fault is the drain pump or the control — and a meter tells the difference for less than the price of guessing.

Samsung Dishwasher Not Draining FAQ